My new website: www.universityp... Electromagnetic waves. EM spectrum, energy, momentum. Electric field and magnetic field. Doppler shift. Polarization. Song at 47:47 is "On the Border" by the Eagles.
Mo G, So sorry to wake everyone up with this nightmare! But if you're not annoyed, you might like my new website: www.universityphysics.education Cheers, Dr. A
He's writing normally. The video is flipped and there are screens in his class that he encourages the students to look at instead of looking at him, since all of the writing will appear backwards if they look at him.
Excellent teaching! It is easier to follow the idea when the professor writes his flow of thought on the blackboard. The "front" blackboard is so innovative.
I think your lecture is wonderful. I understood this as a child (I am now 72) as I was coached by my uncle, a chemist at ORNL, but have found few people that can comprehend or care about such things. But we love what we love. I would like to just randomly add that heating the concrete you mentioned around 1:15:00 is something I did a few years ago with a carbon arc. I think it was arcing at about 36V @ 70A. It ended up being a bad idea as apparently the water vapor in the concrete caused the hot-spot to explode (after becoming red hot) and blow very hot pieces of concrete all around and into my face. I was not injured seriously but it taught me a lesson that extreme temperatures (or anything else) can do unexpected things. Lastly, even after all these years, I still enjoy a good presentation like you posted here. I know it has been seven years since you posted but please keep up the good work and enjoy life. I know it would be subjective but it would be interesting to plot real-time ageing years with perceived ageing years as we grow older.
Brilliant! The teacher and teaching style. Engineering and science students of today are so fortunate to have access to such material and great teachers like Prof. Anderson! Keep strong, Sir!!
You Sir are an amazing teacher. If all my teaches, instructors and professors were like you school would have been a whole lot easier. Thanks for sharing.
I wondered, what are the odds of being able to write backwards, AND write backwards well, AND write backwards well...left handed. At this point I realised that it's far more likely that you're using a video camera to invert the image. Then I realized how cute it was that you demonstrated the Right Hand Rule using your left hand. lol
I write with my left hand and I can read and write backwards fairly well so I didn't even think about this at all until I saw your comment... I can also write with my right hand though and write mirror images simultaneously with both hands that look similar. I cannot however, write different things with both hands at the same time.
@@gustavofoss2280 I've been pretty busy lately so it took me a little while to get around to doing this. I hope this counts. I also hope UA-cam lets me attach a link like this because this is the first time I've tried to link a video. ua-cam.com/video/8p9ovhYgACY/v-deo.html
Thank you for that. Well put!! My previous experimentations with the "B" field , about 2 years ago began quite simply after reviewing the Coral Castle installations I realized that after seeing that his generator was built to maximize the "B" field by using "V" magnets I wanted to see what effects the "B" field had on ordinary rocks . So I went to my front yard and picked up a stone and weighed it , 38 Grams, then I was carful only tap it with the "B" field of a magnet , It dropped in weight to 22 grams. I believe the key is to find the correct frequency to vibrate the "B field and it should float.. No wonder magnetic rocks were called "load stones
No, the length is good. The prof at my university always tried to cover a whole chapter in 20 mins video. So I always read the book and went to your vids when I was confused about the concepts. Great that I had been having high A's in the past exams, now just one more final to go and I am gonna rewatch a few of your vids. Thank you again, and Merry Christmas to you and your family!!
@@yoprofmatt Excellent lecture Matt, I'll have to watch the others you've done. Presuppose this, if you were living in a closed system & the Sun was within that system how would this effect what you have transcribed..... ?
Prof Matt.Please,can I get your video lecture on how to Deduce the Electromagnetic wave equation for magnetic field strength using the uniform plane wave components.
Not only is this amazing in terms of content and easy comprehension (only 30 minutes in), but can we all just admire that he is writing backward on a transparent board. I’m sure some may find that common, but to explain it so well without skipping a beat and everything being so legible. Major kudos. I will now be subscribing.
Sorry professor, you forgot to mention a very big point, you should have mentioned that your graphs are based on the idea that we are running AC current through the wires since DV current will only create constant E and B.
Being a scientist is my hobby and I am starting to revisit the sciences because I now have the time to do so. Your point on the duality of em spectrum is actually true at any point of the spectrum because everything is truly made of particles and depending on your distance from the point of the spectrum every point becomes a wave. Do you agree with this? I am correct to make this conclusion? I am looking at this on point of view of chemistry.
Kind of a late comment but you are correct, the reason things like gamma rays act like particles is because they are oscillating so extremely fast that when viewed over a longer distance it is almost indiscernible from a straight path. Shorten the distance enough though and you will be able to make out the wave like path that you typically see with all EM waves. On the opposite end of the spectrum you have the exact opposite. With low frequency radio waves they travel in long drawn out waves making them act more like a wave than a particle traveling through space. So when viewed over a longer distance they behave like waves. However, if you shorten observing distance, the waves are so stretched out that their path then when viewed over that short distance it looks like a straight line because of how gentle the oscillations are. I hope this helps if you never found an answer to your question.
💀 I just left school a few hours ago and this is the first thing I choose to watch 😭and I finished it I can't even focus when school when we have free time
thank you for making physics seem so simple. I was taught physics some 30 yrs ago where the teaching aids were just a simple chalk and a board.. usually black, and of course half the time you're just looking at the teacher's back.. and if she was a beautiful curvaceous teacher, young testosterone filled young minds like mine was back then, your never really paid much attention to the board .. really.. so thank you for your beautiful explanation and your smart learning glass style teaching..
That's smart! And he's not wearing wedding band on right hand. He was careful when he talked about "right hand rule" to use his left hand and he draw the B filed backwards from a normal blackboard!
Fari Fairis, Not writing backwards (I'm not that talented). The board is called Learning Glass. You can check it out at www.learning.glass Cheers, Dr. A
@@yoprofmatt Yes, I know. I just tried to explain that it is not 'writing backwards'. Thank you, Professor! My wife is a lecturer in Organic Chemistry, she may need the Glass as we should make a lot of videos for online classes.
@@farifairis7388 maybe she could talk about fluorescence? He writes normally like you say on the glass using a fluorescent marker. The glass is illuminated from the side. The ink absorbs UV light & then re-emits it making the ink brighter. The light passes through the glass & reaches his audience's eyeballs - they see backwards writing. The light also hits a mirror which reflects it into a camera. As it does so it inverts the image so that the camera records the writing the correct way around. (Alternatively it could've been inverted using computers)
it's been over 50 years since i sat in a physics class, and yet, while taking in your class, each time you asked a question, i hesitated and then muttered the correct answer, though i was fully expecting to be mistaken. i was encouraged to discover i WAS understanding you! when you drew your diagram of the induction circuit, i thought about what you said, rather than what you drew--i'm no good at reading diagrams of electrical circuits-- but i thought about AM and FM radio and the odd fact that most radio antennae are just about 4 feet long. i remember finding that out, back when tv was going over to precise digital signal lengths and the FCC was assigning specific wavelengths to stations, and other petitioners were requesting broadband ranges for other uses, like emergency responders--and i realized i would have to have an antenna for my digital TV that was a bit longer than the longest TV or radio wave the FCC had licensed! and it was important that the antenna be straight-- not some carelessly tossed curly cord, i jammed behind my stereo--like i'd seen a lot of lazy friends do-- and then bitch that 'they didnt get their stations in'!! your EM spectrum diagram made it perfectly clear as to why that matters.
This is some great instruction (Not to mention free...Thanks!). However, I'm having a hard time conceptualizing how EM waves would travel along a solid medium such as a coaxial copper clad cable. Do the EM waves propagate THROUGH the diameter of the round center conductor? Or do the waves spiral around the outer edge of the center conductor?
UA-camr Teyze, Not writing backwards (I'm not that talented). The board is called Learning Glass. You can check it out at www.learning.glass Cheers, Dr. A
I really liked this approach and was going to use it for a course that I am teaching concerning EM waves. HOWEVER, as you move those charges closer together the E field between them gets larger (MUCH LARGER as you approach zero) Next, can a negative and positive occupy the same point? NO. While this gets at the idea of an alternating E and B field, it may be more harm to tell them that as charges get closer their E field decreases between them.
Very very important especially for poor meritorious in Covid times when we cannot enjoy such basics of Electromagnetic Waves of Maxwell with such down to earth without a need of curl div etc Thank you to you
You are welcome and thanks very much for the comment. Glad people are finding these useful, particularly during this prolonged pandemic. Be safe and well. Cheers, Dr. A
All of electromagnetism (Maxwell's equations etc.) should be taught in terms of Clifford's geometric algebra. Instead of 4 Maxwell equations, it reduces to one. I still don't understand why geometric algebra is not taught, even to undergraduate students. It makes things so much easier.
I took a course for Engineering Drafting in the 70's called Descriptive Geometry, was used to accurately visualize different view planes to achieve accurate dimensions when projecting oblique views of an object your are drawing on 2d paper. Yes before computers it was all done on paper. Analytical Geometry was taught for mechanical engineers with the push into calculus. Are there any links to this Geometric Algebra you describe? Sorry im confused by that term. Thanks.
I fell asleep watching a video about birds and I just woke up to this, it sounds quite interesting but I'm too dumb to understand it though. thanks for the lecture :)
Thank you, I missed lecture on EM on my Engr physics 2 class but I am sure I would never be able to understand to this detail and so easily in class. Thank you so much
I'm enjoying this lecture quite a lot thus far. Thank you very much for making this recording available to the general public, free of charge! One tiny, minor note: There is an oscillating, brushing kind of noise each time you stop talking, it is slightly distracting.
11:30".- The electromagnetic wave is poorly drawn. See that at one point the emitted wave has an instant in which the electric field is zero and at that same instant the magnetic field is zero. That is, the electromagnetic field is zero, and the energy of that field, therefore, is zero. The drawing relationship of both cambos must be pi / 2, that is, 90º. When the electric field is at 0º, its field is zero, and at this moment the magnetic field must be maximum, in such a way that all the energy of the most magnetic electric field is E sub BM. And when the electric field is maximum, the magnetic field has transformed all its energy into zero, in such a way that the energy is constant. Dr. Elio Verde, physicist from Venezuela.
I wish we could have evolved primarily outside of the water so that we could be exposed to the infrared light early on so that maybe we could have infrared vision by now. The history of the human eye lies deep in the ocean where infrared light can't reach, so we never adapted to its incredible power!
THANKYOU ! VERY INTERESTING. I only did a year (or so) of"Elect. Engineering in but I found you taught me more that I learned ! Pretty sure I subscribed a while ago in I just have to find the time to watch you ! I do try to send the "link" to my friends who will apppreci ate you.... Thanks again, Ken Colvin-- Melbourne (Aust. )
This is amazing content 💯 not many videos this comprehensible to this level/degree/etc to the extent it’s created so well that it can be understood casually watching it through the first time. The way the material is presented should be established as one of the baselines/standards/etc for our schools/colleges/etc in the complimentary digital/online/etc post Covid pandemic era 💯 this is beautiful stuff ! Well done 👏🏾Thanks for spending the time to create content like this 🙏🏾👍🏾Curious if every video from this guy/channel is like this 🤩🤓🙏🏾
It may have been recorded in the morning and in that case I would be doing the same, but the students in this video seem very uninterested and not wanting to be there. And it’s sad because this is the type of lecture I would love to be in. I hope you are still teaching courses because your way of teaching needs to be spread through all subjects and universities.
I always get confused by the sinusoidal E and B fields of an EM wave being drawn as being in phase. My confusion arises as I think in terms of static fields and from that perspective the energy goes to zero when E and B are zero, whereas I'd expect energy in the photon to be constant at all instants in time.
Prof. Anderson, how do we arrive at the fact that the energy contained in the electric field is equal to the energy contained in the magnetic field for an em wave?? Kindly explain the answer. Loved your entire lecture!!!!
Power output was calculated as a circle defined by a square meter at earths surface and the units wouldn’t work. And we’re not shown. It should have been calculated by the surface area of a sphere.
At 18:37 the Professor says how do we adjust the capacitor? And then moves his hands laterally. Woke me up to the Variable Capacitor that I want to think of as a Potentiometer. Not only am I learning from this professor's words, I'm learning from hand movements! At 49:08 Professor says that the EM field goes up and down. However, wouldn't that be the electric field that goes up and down and the magnetic field would be at 90 degrees? Would it be the magnetic field that would have to go up and down to cause and electrical current to go up and down the radio antenna to be picked up by the circuit? The antenna only uses half of the EM field?
At the beginning, why do the nodes of the magnetic field coincide with the nodes of the electric field? Do the separating charges stop "flowing analogous to current", thus yielding zero magnetic field, when the magnitude of the electric field is greatest?
At 12:11 shouldnt the B field have its maximum at the time stamp when the E field has its greatest rate of change, therefore the B field having a 90 degrees phase shift?
Thank you so much! This has cleared up so many things for me, but I still have some questions? 1. When an electron releases an electron it emits an electron and goes down to a lower energy level. The picture looks like a negative particle (electron) and a positive particle (protons) getting closer together akin to the picture the prof draws around 3:00, but they never oscillate (do they?) and that's enough to create a photon? 2. Are all photons exclusively created from electrons? Are there other ways that a photon can be created?
I fell asleep watching something and somehow ended up on this video when I woke up
Haha same boat here 😂
Same !
Same
Yeah the YT algorithm is starting to piss me off
Mo G,
So sorry to wake everyone up with this nightmare!
But if you're not annoyed, you might like my new website: www.universityphysics.education
Cheers,
Dr. A
The effortless reflected handwriting is really impressive and neat! It’s fascinating to watch the writing appear almost as if by magic
How does this board work?
i thought they mirrored the video but I guess not
Right I was thinking the same exact thing. He’s a legend for this skill
@@sudo1500 It appears he's left-handed.
He's writing normally. The video is flipped and there are screens in his class that he encourages the students to look at instead of looking at him, since all of the writing will appear backwards if they look at him.
Excellent teaching! It is easier to follow the idea when the professor writes his flow of thought on the blackboard. The "front" blackboard is so innovative.
I think your lecture is wonderful. I understood this as a child (I am now 72) as I was coached by my uncle, a chemist at ORNL, but have found few people that can comprehend or care about such things. But we love what we love. I would like to just randomly add that heating the concrete you mentioned around 1:15:00 is something I did a few years ago with a carbon arc. I think it was arcing at about 36V @ 70A. It ended up being a bad idea as apparently the water vapor in the concrete caused the hot-spot to explode (after becoming red hot) and blow very hot pieces of concrete all around and into my face. I was not injured seriously but it taught me a lesson that extreme temperatures (or anything else) can do unexpected things. Lastly, even after all these years, I still enjoy a good presentation like you posted here. I know it has been seven years since you posted but please keep up the good work and enjoy life. I know it would be subjective but it would be interesting to plot real-time ageing years with perceived ageing years as we grow older.
Brilliant! The teacher and teaching style. Engineering and science students of today are so fortunate to have access to such material and great teachers like Prof. Anderson! Keep strong, Sir!!
You Sir are an amazing teacher. If all my teaches, instructors and professors were like you school would have been a whole lot easier. Thanks for sharing.
Electromagnetic Waves travelling from my screen to my retina are teaching me about themselves.
If you smoke anymore you will come up with a Unified theory, do you want strings? This is how you get multiple universes!
TheSatchmo93 nb
mETaphYsIcS
😌
I really laughed thanks.
I wondered, what are the odds of being able to write backwards, AND write backwards well, AND write backwards well...left handed. At this point I realised that it's far more likely that you're using a video camera to invert the image. Then I realized how cute it was that you demonstrated the Right Hand Rule using your left hand. lol
Ah...I get it now... I see the wedding ring
I write with my left hand and I can read and write backwards fairly well so I didn't even think about this at all until I saw your comment...
I can also write with my right hand though and write mirror images simultaneously with both hands that look similar. I cannot however, write different things with both hands at the same time.
@@gustavofoss2280 I've been pretty busy lately so it took me a little while to get around to doing this. I hope this counts.
I also hope UA-cam lets me attach a link like this because this is the first time I've tried to link a video.
ua-cam.com/video/8p9ovhYgACY/v-deo.html
wut?
@@kraziecatclady Lol.. GG for actually proving it.. you need to work on the mirror stuff a bit though 😉
Thank you for that. Well put!! My previous experimentations with the "B" field , about 2 years ago began quite simply after reviewing the Coral Castle installations I realized that after seeing that his generator was built to maximize the "B" field by using "V" magnets I wanted to see what effects the "B" field had on ordinary rocks . So I went to my front yard and picked up a stone and weighed it , 38 Grams, then I was carful only tap it with the "B" field of a magnet , It dropped in weight to 22 grams. I believe the key is to find the correct frequency to vibrate the "B field and it should float.. No wonder magnetic rocks were called "load stones
okay sir, i am 3 minutes in and i'm completely blown away by how well you explain things.
This is one awesome video! Thank you professor Anderson!!
Thanks. I usually try to keep them a bit shorter, but this one got away from me.
Cheers,
Dr. A
No, the length is good. The prof at my university always tried to cover a whole chapter in 20 mins video. So I always read the book and went to your vids when I was confused about the concepts. Great that I had been having high A's in the past exams, now just one more final to go and I am gonna rewatch a few of your vids.
Thank you again, and Merry Christmas to you and your family!!
Can agree, good explanation somehow perhaps better than I had at my High Technical Education at Eindhoven, Netherlands. Thanks and like to see more.
@@yoprofmatt
Excellent lecture Matt, I'll have to watch the others you've done.
Presuppose this, if you were living in a closed system & the Sun was within that system how would this effect what you have transcribed..... ?
Prof Matt.Please,can I get your video lecture on how to Deduce the Electromagnetic wave equation for magnetic field strength using the uniform plane wave components.
Not only is this amazing in terms of content and easy comprehension (only 30 minutes in), but can we all just admire that he is writing backward on a transparent board. I’m sure some may find that common, but to explain it so well without skipping a beat and everything being so legible. Major kudos. I will now be subscribing.
Thanks. Not to burst your bubble, but there's a trick:
ua-cam.com/video/CWHMtSNKxYA/v-deo.html
Cheers,
Dr. A
Sorry professor, you forgot to mention a very big point, you should have mentioned that your graphs are based on the idea that we are running AC current through the wires since DV current will only create constant E and B.
Being a scientist is my hobby and I am starting to revisit the sciences because I now have the time to do so. Your point on the duality of em spectrum is actually true at any point of the spectrum because everything is truly made of particles and depending on your distance from the point of the spectrum every point becomes a wave. Do you agree with this? I am correct to make this conclusion? I am looking at this on point of view of chemistry.
Kind of a late comment but you are correct, the reason things like gamma rays act like particles is because they are oscillating so extremely fast that when viewed over a longer distance it is almost indiscernible from a straight path. Shorten the distance enough though and you will be able to make out the wave like path that you typically see with all EM waves. On the opposite end of the spectrum you have the exact opposite. With low frequency radio waves they travel in long drawn out waves making them act more like a wave than a particle traveling through space. So when viewed over a longer distance they behave like waves. However, if you shorten observing distance, the waves are so stretched out that their path then when viewed over that short distance it looks like a straight line because of how gentle the oscillations are. I hope this helps if you never found an answer to your question.
It really helped me for my exam!! Hope you will release a series about Astrophysics 😀😀
💀 I just left school a few hours ago and this is the first thing I choose to watch 😭and I finished it I can't even focus when school when we have free time
thank you for making physics seem so simple. I was taught physics some 30 yrs ago where the teaching aids were just a simple chalk and a board.. usually black, and of course half the time you're just looking at the teacher's back.. and if she was a beautiful curvaceous teacher, young testosterone filled young minds like mine was back then, your never really paid much attention to the board .. really.. so thank you for your beautiful explanation and your smart learning glass style teaching..
For people that thinking if he was writing backwards: look on his shirt, the video is flipped..
That's smart! And he's not wearing wedding band on right hand.
He was careful when he talked about "right hand rule" to use his left hand and he draw the B filed backwards from a normal blackboard!
Fari Fairis I was just wondering about that!!! Thanks for clearing it up!
Fari Fairis,
Not writing backwards (I'm not that talented). The board is called Learning Glass. You can check it out at www.learning.glass
Cheers,
Dr. A
@@yoprofmatt Yes, I know. I just tried to explain that it is not 'writing backwards'.
Thank you, Professor!
My wife is a lecturer in Organic Chemistry, she may need the Glass as we should make a lot of videos for online classes.
@@farifairis7388 maybe she could talk about fluorescence? He writes normally like you say on the glass using a fluorescent marker. The glass is illuminated from the side. The ink absorbs UV light & then re-emits it making the ink brighter. The light passes through the glass & reaches his audience's eyeballs - they see backwards writing. The light also hits a mirror which reflects it into a camera. As it does so it inverts the image so that the camera records the writing the correct way around. (Alternatively it could've been inverted using computers)
it's been over 50 years since i sat in a physics class, and yet, while taking in your class, each time you asked a question, i hesitated and then muttered the correct answer, though i was fully expecting to be mistaken. i was encouraged to discover i WAS understanding you! when you drew your diagram of the induction circuit, i thought about what you said, rather than what you drew--i'm no good at reading diagrams of electrical circuits-- but i thought about AM and FM radio and the odd fact that most radio antennae are just about 4 feet long. i remember finding that out, back when tv was going over to precise digital signal lengths and the FCC was assigning specific wavelengths to stations, and other petitioners were requesting broadband ranges for other uses, like emergency responders--and i realized i would have to have an antenna for my digital TV that was a bit longer than the longest TV or radio wave the FCC had licensed! and it was important that the antenna be straight-- not some carelessly tossed curly cord, i jammed behind my stereo--like i'd seen a lot of lazy friends do-- and then bitch that 'they didnt get their stations in'!! your EM spectrum diagram made it perfectly clear as to why that matters.
Welcome back! The water's fine.
Thanks for your comments. Some of the old devices were excellent instructive tools.
Cheers,
Dr. A
Teaching is hard enough without having to write everything backwards!
Lots of fun watching him draw at 1.5x playback speed. 😁
He was born and raised on Bizzaro world
What's even more fascinating is how he's getting that writing to just 'hang in mid air'.
I hope these comments are jokes.
@@altuber99_athlete mine was, I can't speak for the rest
I saw this a couple of years ago and I finally understood it! Now I'm back for some more Matt-mathics to brush up my knowledge! :)
This is some great instruction (Not to mention free...Thanks!). However, I'm having a hard time conceptualizing how EM waves would travel along a solid medium such as a coaxial copper clad cable. Do the EM waves propagate THROUGH the diameter of the round center conductor? Or do the waves spiral around the outer edge of the center conductor?
Fell asleep somewhen in the night, woke up to this on the 40 minute mark, started the video from the beginning and watched the whole thing
Hope you made some popcorn.
Cheers,
Dr. A
Excellent Scribe! Left handed and backwards!!! Physics is Phun ! Thank goodness 🙏🚂🎼🌹🎵🎶⚕🕊🧰🛠
This is like the adult version of Dora the explorer "what's this big metal rod?"
Me: the antenna!
Him: the antenna.
Bro his skill to right reflected is as impressive as the information he’s teaching mind blowing
its a mirrored screen man
previously I tried to understand em waves from many sources. it was too easy to understand em waves clearly from this video. Thank you.
You're very welcome.
Cheers,
Dr. A
WOW!, I accidentally clicked on this and two hours later I'm going to the next video. You are an awesome Professor! Cheers Shu!
Wow, thanks for that. Doing my best.
Cheers,
Dr. A
Thank you alot professor. Cannot thank you enough being honest. Really appreciate, plus the fact this gold lectures are free. May god bless you!
Superb lecture. Should be mandatory for every science class. Could save some sleepless nights for many students.
I'm just astounded as I watch him write mirrored on this clear board so it makes sense to us the audience.
Info here: www.learning.glass
Cheers,
Dr. A
@@yoprofmatt wow that's so cool!
When writing on the glass like this, how does the writing look reverse on the camera?
Flipped video in post editing.
UA-camr Teyze,
Not writing backwards (I'm not that talented). The board is called Learning Glass. You can check it out at www.learning.glass
Cheers,
Dr. A
Thanks Professor Anderson. it feels like I have understood something.
Omg I finally understand this.
Feel very grateful to learn this valuable knowledge in such an easy access nowadays🙏
underrated channel if he was in india he would be the best for jee and neet
Great Job Prof.You are helping us understand our universe better and giving us the power we need.Thanks
THİS İS THE BEST EXPLANATİON İ HAVE SEEN SO FAR. Pass my thanks to your professor, please. Farhad from Azerbaijan.
Hello to all my Fandersons in Azerbaijan! Great to hear from you.
Cheers,
Dr. A
Thanks for your valuable lessons sir.....
Your help made me excel in my studies......
I really liked this approach and was going to use it for a course that I am teaching concerning EM waves. HOWEVER, as you move those charges closer together the E field between them gets larger (MUCH LARGER as you approach zero) Next, can a negative and positive occupy the same point? NO. While this gets at the idea of an alternating E and B field, it may be more harm to tell them that as charges get closer their E field decreases between them.
I grateful Professor Anderson for this great enlightenment
I am from India , this is soo amazing and awesome , gret explanation , you deserve 💞
Thank you so much 😀 Love my Fandersons™ in India.
Cheers,
Dr. A
actually this was the lecture that i needed on em wave
Very very important especially for poor meritorious in Covid times when we cannot enjoy such basics of Electromagnetic Waves of Maxwell with such down to earth without a need of curl div etc Thank you to you
You are welcome and thanks very much for the comment. Glad people are finding these useful, particularly during this prolonged pandemic. Be safe and well.
Cheers,
Dr. A
All of electromagnetism (Maxwell's equations etc.) should be taught in terms of Clifford's geometric algebra. Instead of 4 Maxwell equations, it reduces to one. I still don't understand why geometric algebra is not taught, even to undergraduate students. It makes things so much easier.
I took a course for Engineering Drafting in the 70's called Descriptive Geometry, was used to accurately visualize different view planes to achieve accurate dimensions when projecting oblique views of an object your are drawing on 2d paper. Yes before computers it was all done on paper. Analytical Geometry was taught for mechanical engineers with the push into calculus. Are there any links to this Geometric Algebra you describe? Sorry im confused by that term. Thanks.
Found it - Scalars and vectors, interesting.
I fell asleep watching a video about birds and I just woke up to this, it sounds quite interesting but I'm too dumb to understand it though. thanks for the lecture :)
Every time I fall asleep to a video I end up here lol.
I am everywhere.
Cheers,
Dr. A
He's leaving out the most descriptive word that would clarify to the poor students the whole thing " VIBRATION"
Thank you, I missed lecture on EM on my Engr physics 2 class but I am sure I would never be able to understand to this detail and so easily in class. Thank you so much
No problem.
Cheers,
Dr. A
I'm enjoying this lecture quite a lot thus far. Thank you very much for making this recording available to the general public, free of charge!
One tiny, minor note: There is an oscillating, brushing kind of noise each time you stop talking, it is slightly distracting.
Sometimes, I feel like I learn faster from watching these videos than actually being in school. Anyway, thanks
Exactly what happened to me, too. Wicked! And I ended up watching all of it. Great!
Thanks. Now go back to sleep.
Cheers,
Dr. A
Thank you this cleared up stuff I still didn’t understand why in welding school and em wave in electromagnetic particle tests
Good to hear.
Welding, super cool.
Cheers,
Dr. A
Just a reminder to viewers that Prof. Matt is writing backwards. Skills.
This video makes me wanna quit drinking and go back to study again.
Wow, what an excellent teacher. World class!
First time feeling that physics is easy thank you sir
This was a nice video to wake up to.
Enjoyed the video. Very straight forward. Only wish that he was more consistent in carrying and cancelling units when solving.
How does he write backwards so easily?!
11:30".- The electromagnetic wave is poorly drawn. See that at one point the emitted wave has an instant in which the electric field is zero and at that same instant the magnetic field is zero. That is, the electromagnetic field is zero, and the energy of that field, therefore, is zero.
The drawing relationship of both cambos must be pi / 2, that is, 90º. When the electric field is at 0º, its field is zero, and at this moment the magnetic field must be maximum, in such a way that all the energy of the most magnetic electric field is E sub BM. And when the electric field is maximum, the magnetic field has transformed all its energy into zero, in such a way that the energy is constant.
Dr. Elio Verde, physicist from Venezuela.
I wish we could have evolved primarily outside of the water so that we could be exposed to the infrared light early on so that maybe we could have infrared vision by now. The history of the human eye lies deep in the ocean where infrared light can't reach, so we never adapted to its incredible power!
THANKYOU ! VERY INTERESTING. I only did a year (or so) of"Elect. Engineering in but I found you taught me more that I learned ! Pretty sure I subscribed a while ago in I just have to find the time to watch you ! I do try to send the "link" to my friends who will apppreci ate you.... Thanks again, Ken Colvin-- Melbourne (Aust. )
This is amazing content 💯 not many videos this comprehensible to this level/degree/etc to the extent it’s created so well that it can be understood casually watching it through the first time. The way the material is presented should be established as one of the baselines/standards/etc for our schools/colleges/etc in the complimentary digital/online/etc post Covid pandemic era 💯 this is beautiful stuff ! Well done 👏🏾Thanks for spending the time to create content like this 🙏🏾👍🏾Curious if every video from this guy/channel is like this 🤩🤓🙏🏾
Wow, thanks for the great comment, I really appreciate it. I'm trying to keep making good content. Sentiments like this keep me going.
Cheers,
Dr. A
Woke up to this like everyone else!
Very clear, right pace and interesting 🤗
Thank you Professor Anderson. Wt. of marble part was real.
It may have been recorded in the morning and in that case I would be doing the same, but the students in this video seem very uninterested and not wanting to be there. And it’s sad because this is the type of lecture I would love to be in. I hope you are still teaching courses because your way of teaching needs to be spread through all subjects and universities.
It was definitely morning, and also I think they were pretty camera shy.
Thanks for your comment, makes me feel good.
Cheers,
Dr. A
Just woke up to this video. Had a nightmare involving being asked physics questions lol
Very good Professor Anderson.
my english is really weak, but I can hear you for a hours :o very impresive
Love the lecture..It entertained my brain.
Hey you, you're finally awake
slept to a Tom Scott's video, woke up to this
Welcome aboard.
Cheers,
Dr. A
3:44
him: we like things that oscillate
me: that's what she said!
What board is he using...I know the video is flipped but is he writing on glass ?
Astounding Lecture.
Thanks much.
Cheers,
Dr. A
I always get confused by the sinusoidal E and B fields of an EM wave being drawn as being in phase. My confusion arises as I think in terms of static fields and from that perspective the energy goes to zero when E and B are zero, whereas I'd expect energy in the photon to be constant at all instants in time.
infrared goggles explanation blew my mind
I opened my UA-cam after few hours of waking up and got no idea how I got here
Seems most people wake up to me confused. Just like my class.
Cheers,
Dr. A
really awesome, the explanation is really easy to understand.
Amazing and valuable class. How come that microwave oven does not perturbate wifi signal since both are at the same frequency of 2.4Hgz?
Prof. Anderson, how do we arrive at the fact that the energy contained in the electric field is equal to the energy contained in the magnetic field for an em wave?? Kindly explain the answer. Loved your entire lecture!!!!
I see how everyone woke up seeing this video. That’s how I discovered the video too. Great video though.
Excellent, grab some coffee and dig in.
Cheers,
Dr. A
Power output was calculated as a circle defined by a square meter at earths surface and the units wouldn’t work. And we’re not shown. It should have been calculated by the surface area of a sphere.
Please clarify which time point in the video you're referring to.
Cheers,
Dr. A
excellent explanation and very easy, to understand
Unique style, good!
At 18:37 the Professor says how do we adjust the capacitor? And then moves his hands laterally. Woke me up to the Variable Capacitor that I want to think of as a Potentiometer. Not only am I learning from this professor's words, I'm learning from hand movements!
At 49:08 Professor says that the EM field goes up and down. However, wouldn't that be the electric field that goes up and down and the magnetic field would be at 90 degrees?
Would it be the magnetic field that would have to go up and down to cause and electrical current to go up and down the radio antenna to be picked up by the circuit?
The antenna only uses half of the EM field?
Writing in mirror image. Amazing
I woke up and this was on as well
If we have the ability to freeze time then it is possible to calculate the value of frequency at rest.
This is good work!!! Earn goodwill!!!
At the beginning, why do the nodes of the magnetic field coincide with the nodes of the electric field? Do the separating charges stop "flowing analogous to current", thus yielding zero magnetic field, when the magnitude of the electric field is greatest?
I fell asleep on a video and woke up 40 seconds in here.
Should you tell me how to settings my Canon and the lighting for my lightboard, thank you for time
Beautiful class!!! I love it!
working with birefringence and retardation to measure stresses across a medium. this lecture brings me back and helps me remember lol
Excellent. Good topics you're working on.
Cheers,
Dr. A
At 12:11 shouldnt the B field have its maximum at the time stamp when the E field has its greatest rate of change, therefore the B field having a 90 degrees phase shift?
Isn't it the E field increasing while the two charges approaches each other?
Thank you so much! This has cleared up so many things for me, but I still have some questions?
1. When an electron releases an electron it emits an electron and goes down to a lower energy level. The picture looks like a negative particle (electron) and a positive particle (protons) getting closer together akin to the picture the prof draws around 3:00, but they never oscillate (do they?) and that's enough to create a photon?
2. Are all photons exclusively created from electrons? Are there other ways that a photon can be created?