The sound of the magnetic domains clicking in the material is amazing. I had read about the domains and interpreted it as a hypotethical explaination(may be because I was not able to understand it completely) but now I know these domains are for real! This demonstration made me shiver and not believing it, I heard it thrice. Hats off to you, Sir.
I don't know why are people watching series and movies having these incredible lessons and demonstrations. You are excellent professor Lewin, I'm really glad every time I see one of your lectures. Thank you for this channel and your life job.
@@vitalino1981 I disagree. I think that the series are more closely related for whatever they're studying/preparing (exam oriented education system, yey!) and hence studying them makes more sense. To-the-point material.
Lectures by Walter Lewin. They will make you ♥ Physics. professor,Thanks to your videos,I got a 49 out of 50 in my class test,nobody bettered me,and I will expect to do so in my board exams as well..THANK YOU Professor
This guy makes me feel good about not knowing this stuff, because he makes it seem so simple, even while the equations and descriptions he uses are very complex. Thank you Walter Lewin for helping me remember what it meant to learn about interesting topics, and for being so open to sharing such information. I have lots of respect for you, sir!!!
Mr Lewin, this lecture had me stand up, take the battery from TV remote and assemble my own motor. Your courses are such a precious gift to students all over the world. Amazing! What is the formula of such great teaching? Thank you!
@@viratrobbie3259 that's not advertising it's truth How can he tell it in a comment Books are not just written to earn Do you think he would be having problem in earning remember he was a teacher at MIT
I was very much excited of this lectures contains 4 demonstrations and a powerpacked Theory class by lewin.....Im so jealous of those people listening lively lewin's class, if im there in lewin class i more luckier but while seeing this lecture via utube....it's ok to be a great fan of him and watching through online.....🙂
This website contains all my 94 course lectures (8.01, 8.02 and 8.03) with improved resolution. They also include all my homework problem sets, my exams and the solutions. Also included are lecture notes and 143 short videos in which I discuss basic problems. ENJOY!
Dr. Lewin, I wish I could have studied under you. Such a brilliant man. A friendly science genius who shares his knowledge so artfully and entertainingly. That poor dog in Australia! “You can’t teach an old dog new tricks.”
Lecturers reduced physics to formulas, and forgot it's about real life, thank you for giving a beautiful visual representation of the concepts you explain, you make all of us love physics
🥰 You are a wonderful teacher❣️ Your students are very blessed to have you for a professor. 💝 Thanks for the great lessons in magneto-electric fields. 🙏💝 I have quite a passion for magnetic fields, piezoelectricity & longitudinal (super~luminal) waves. ✨ 😜 Woo-hoo! 👍😁
Sr 71 blackbird comes to mind. At Fourth Avenue Jr High Yuma Arizona, I a seventh grade student was lucky to have had amazing teachers. The motor that won in this video I as all of the class built. The winner was whom could biild it faster. I truly enjoyed this video not just for free knowledge, but of how easily he explained it all as commonsense. Muchas gracias from a high school dropout.
Hats off for prof Walter. You truly made me love for physics. Believe it or not before I started to watch your videos I hate physics and did study it just for passing the exam. Yet now I have changed myself and started to carry on my entire life linked with physics ❤️❤️
Sir ur way of teaching physics inspire many youngminds who come to teaching fields. It's unbelievable to me I cont express my feelings when I hear the sounds of domains. Tq sir
What an absolute mind blowing lecture! Never thought magnetism chapter could be so interesting. Just amazed. Thnx a lot professor for making my brain work ! 🙏🙏🙏🙏🙏🙏🙏
With cracking sound, we infer that atoms changing positions - domain alignment with the field. Will a polycrystalline ferromagnetic material become a single crystalline material so that making single crystals easier? I am wondering this for a quite long time.
tq u so much sir now I understood diamagnetism.u are the great teacher u make us fall in love with physics. seriously in our college teachers won't explain like u sir .A great HADSOFT TO YOU SIR
Very good. There is an explanation for the domains. In a ferromagnetic material, all the electrons spins at the same direction, both in translation and rotation movements. A pleasure listen to you.
Im agravated to have never had the oppurtunity to be tought by Lewin. im late to the facination of physics. the Lectures i study on youtube are like treasure.
Sir, why are the ferromagnetic materials used as magnetic shields? Ferromagnetic materials have large magnetic permeability, thus the magnetic field inside a ferromagnetic material increases to a larger value as compared to that in vaccum or air. Then, how does a ferromagnetic material stop or shield the external magnetic field ??
Walter Lewin for physics and Andrew Szydlo for chemistry and Matt Parker for math. Just as every teacher should be - they totally grasp you and even if you already know what they are talking about, you can not stop listening and watching.
+daniel; njuguna Make them LOVE physics and let them feel that you LOVE them too. Your enthusiasm and energy and love should be contagious. Make them laugh, make them cry, make them sit on the edge of their seats, make them stop breathing and even make them sometimes wet their pants. YES, I CAN DO ALL THAT whenever I want to.
I have tried n it is working. Thank you prof. I need more resources because some of the experiments you do are too lively n motivate students because they can associate themselves with it
Amazing experiments! U are teaching us from miles away and coming from past taking us to future. I was a impertient, ignorant teenager while this video was being recorded :)
Hello, in the laboratory I saw the following phenomenon: A metal ball is held by an electromagnet but if the switch is opened or the source is disconnected, it remains there for a long time, it does not fall. Sometimes it happens, sometimes it doesn't, for no apparent reason. The strangest thing is that if the voltage of the source is increased and then disconnected, the sphere is less magnetized than when the voltage was lower. The voltages are small values of 1.5 v of 3v What could be the reason for this?
Sir u are great. Ur problem solving and concept classes really help to solve the extraordinary problems of jee advance. Can u plz come with many more conceptual lectures on u tube. I really thankfull to u to blow my interest in physics Also.
Dear professor, do you have any plans in doing some content in theoritical physics? I would love to see an overview of physics like a guideline for those that gone through your lectures and wants to dive into physics more but does not know where to start. Let me tell you that your lectures are truly amazing and i really miss them when i can't find one in a topic i am currently working on.
How current depends on loudness created by change in domains direction? Is it because of heat generated through out or any other reason? Please anyone having answer ,Respond.
Thank you for this amazing lecture and the so many others :) I am actually a master student (in Tunisia) and i would like to know if you have any suggestions on books or lectures about ferromagnetism paramagnetism and diamagnetism on microscopic scale ?
Respected sir, at time 9:03 you said that 'all materials when you exposed them to an external magnetic field will to some degree oppose the external magnetic field. However, in the case of paramagnetic materials, the induced magnetic dipoles are such as to increase the external magnetic field. Here, I am confused about the phrase 'all materials'.
@@lecturesbywalterlewin.they9259 Respected sir, i like too much the way you teach physics. You are a great teacher of physics. I am a PGT physics teacher in Bihar state India. One thing i would like to know from with honestly what tis the cause of all causes and the living sprit in every creature and the source of Consciousness? Can somthing be created from nothing? What is the primordial cause of universe? Big bang theory is model or reality? If i asked you too much then forgive me 🙏 have you ever read vedas and upnisad or srimadbhagwatam and Gita? 🙏
@@amreshkumar8730 He already answered all your questions in his only response to you. Everything you asked is right there. I suggest you go to some websites that don't cater to your belief or work backwards from a conclusion if you want objective answers to your questions. If your goal is to use those questions to bring any intelligent being around to your beliefs, you are waisting your time.
sir electron moves around the the nucleas. when the magnetic dipole moment due to this motion of the electron the magnetic moment of the atom = current *area of the orbit in which electron is moving. sir electron also spin is there will be magnetic dipolemoment associated with this motion of the electron.
@8:30 Why it is the area A that is the vector rather than the current I in the formula for magnetic moment?! I see current having the direction, rather then a surface.
Sir, I am not having Gaincoli's physics for scientists and engineers instead I have physics for scientists and engineer by Serway and Jewett. Is it okay to solve problems from it. It has topicwise problem set at the end of each chapter. So, should I solve those topicwise problem after watching the lecture of a certain topic?
Professor Lewin, in this lecture you stress repeatedly that the poles of the magnet need to have a nonuniform field for the ferromagnetic material to have an effect and have a stronger field than the vacuum field. Could you elaborate on this please?
Really, the domains generating a sound is unbelievable. I don't know, who would ever imagine such a possibility of demonstrating domains! Hat's off!
guitar pickup.
The sound of the magnetic domains clicking in the material is amazing. I had read about the domains and interpreted it as a hypotethical explaination(may be because I was not able to understand it completely) but now I know these domains are for real! This demonstration made me shiver and not believing it, I heard it thrice. Hats off to you, Sir.
+Anery Patel yes Anery, it is amazing!
I don't know why are people watching series and movies having these incredible lessons and demonstrations. You are excellent professor Lewin, I'm really glad every time I see one of your lectures. Thank you for this channel and your life job.
:)
Mauricio Barda
People like to watch series because it's not require brain, in opposite to learning process.
@@vitalino1981 I disagree. I think that the series are more closely related for whatever they're studying/preparing (exam oriented education system, yey!) and hence studying them makes more sense. To-the-point material.
😄 I agree. 🧐 I could watch this guy all day. 😍 He's wonderful! 👍
The more I listen to Dr. Lewin, the more I love him. One of kind. Thank you for sharing your wisdom.
Lectures by Walter Lewin. They will make you ♥ Physics. professor,Thanks to your videos,I got a 49 out of 50 in my class test,nobody bettered me,and I will expect to do so in my board exams as well..THANK YOU Professor
SUPER
This guy makes me feel good about not knowing this stuff, because he makes it seem so simple, even while the equations and descriptions he uses are very complex. Thank you Walter Lewin for helping me remember what it meant to learn about interesting topics, and for being so open to sharing such information. I have lots of respect for you, sir!!!
Mr Lewin,
this lecture had me stand up, take the battery from TV remote and assemble my own motor. Your courses are such a precious gift to students all over the world. Amazing!
What is the formula of such great teaching?
Thank you!
+Vadim Tikanov Thanks for your kind words. You can find the formula of "such great teaching" in my book "For the Love of Physics".
@@lecturesbywalterlewin.they9259 that is some amazing advertising professor! XD Big fan from india,and of the book!!
@@viratrobbie3259 that's not advertising it's truth How can he tell it in a comment
Books are not just written to earn
Do you think he would be having problem in earning remember he was a teacher at MIT
I was very much excited of this lectures contains 4 demonstrations and a powerpacked Theory class by lewin.....Im so jealous of those people listening lively lewin's class, if im there in lewin class i more luckier but while seeing this lecture via utube....it's ok to be a great fan of him and watching through online.....🙂
This website contains all my 94 course lectures (8.01, 8.02 and 8.03) with improved resolution. They also include all my homework problem sets, my exams and the solutions. Also included are lecture notes and 143 short videos in which I discuss basic problems.
ENJOY!
Thnx sir!!☺
Sir what is the cause of diamagnetism ...Why the atoms oppose the external field ??..Plz.help me sir!
@Anupam he told that it has something to do with quantum mechanics
@@anupambiswas8746 if you have studied 12th grade physics , you will know
which website?
Sir, you have explained to me the concepts of dia-, para- ferro- magnetism better than anybody else.... thanks for making me a fan of Physics again...
Whenever I watch this teacher I'm amazed the way he explain the teachings and also the experiments. My highest tespects.
This man has a talent for explaining physics + the budget obviously
I am indian and i watched professor s 21 lectures straight ❤ may be many of them I watched twice❤❤❤
Dr. Lewin, I wish I could have studied under you. Such a brilliant man. A friendly science genius who shares his knowledge so artfully and entertainingly. That poor dog in Australia! “You can’t teach an old dog new tricks.”
Lecturers reduced physics to formulas, and forgot it's about real life, thank you for giving a beautiful visual representation of the concepts you explain, you make all of us love physics
🥰 You are a wonderful teacher❣️ Your students are very blessed to have you for a professor. 💝 Thanks for the great lessons in magneto-electric fields. 🙏💝 I have quite a passion for magnetic fields, piezoelectricity & longitudinal (super~luminal) waves. ✨ 😜 Woo-hoo! 👍😁
What a legend. Grateful to be alive in the same era as him.
Sr 71 blackbird comes to mind. At Fourth Avenue Jr High Yuma Arizona, I a seventh grade student was lucky to have had amazing teachers. The motor that won in this video I as all of the class built. The winner was whom could biild it faster. I truly enjoyed this video not just for free knowledge, but of how easily he explained it all as commonsense. Muchas gracias from a high school dropout.
Hats off for prof Walter. You truly made me love for physics. Believe it or not before I started to watch your videos I hate physics and did study it just for passing the exam. Yet now I have changed myself and started to carry on my entire life linked with physics ❤️❤️
This lecture had greatly helped me for my seminar... Thank you Lewin sir...
I wonder if she still has the thermometer?
I have a thermometer just like that.
Sir ur way of teaching physics inspire many youngminds who come to teaching fields.
It's unbelievable to me
I cont express my feelings when I hear the sounds of domains.
Tq sir
It's my pleasure
I don't think who is this first time I saw you in UA-cam but u r every best teacher of physics 🙏🙏🙏🙏🙏
What an absolute mind blowing lecture! Never thought magnetism chapter could be so interesting. Just amazed. Thnx a lot professor for making my brain work ! 🙏🙏🙏🙏🙏🙏🙏
Most welcome!
This man's ability to communicate is amazing.
Can u tell ur magnitude and direction
With cracking sound, we infer that atoms changing positions - domain alignment with the field. Will a polycrystalline ferromagnetic material become a single crystalline material so that making single crystals easier? I am wondering this for a quite long time.
Best ever lecture. 👌🏾👌🏽👌🏿👌🏾👌🏽👌🏿👌🏾👌🏽👌🏽👌🏾👌🏿👌🏽👌🏿👌🏽👌🏿🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏💎💎💎💎💎💎💎💎💎💎😘😘😘😘😘😘😘😘😘😘💪💪💪💪💪💪💪💪💪💪👼👼👼👼👼👼👼👼👼👼Keep it up 👍
demonstrations are very good and amazing. thank you Sir!!
tq u so much sir now I understood diamagnetism.u are the great teacher u make us fall in love with physics. seriously in our college teachers won't explain like u sir .A great HADSOFT TO YOU SIR
It's my pleasure
Very good.
There is an explanation for the domains. In a ferromagnetic material, all the electrons spins at the same direction, both in translation and rotation movements.
A pleasure listen to you.
Many thanks for such a breathtaking demonstrations!
You're very welcome!
Dear sir, i am your great fan, i am a PGT physics teacher from India, Bihar 🙏.
Great 👍
the Dipoples-domain experiment at 28:35 certainly put a smile on my face, truly amazing
29:30 That was impressive!!! Thanks a lot Prof
The demonstrations are undoubtedly very insightful. Would appreciate a reciprocation from Prof. Lewin so that I can share ideas.
First rate demos, and very clear explanations.
Thank you kindly!
Absolutely legendary lecture, I miss having lectures like this.
great sir
this is the actual teaching of science through experiments
i am also trying to teach chemistry to my students
thanku sir
with LOVE
Passion is obvious & makes this fun and understandable
Im agravated to have never had the oppurtunity to be tought by Lewin. im late to the facination of physics. the Lectures i study on youtube are like treasure.
Sir, why are the ferromagnetic materials used as magnetic shields?
Ferromagnetic materials have large magnetic permeability, thus the magnetic field inside a ferromagnetic material increases to a larger value as compared to that in vaccum or air.
Then, how does a ferromagnetic material stop or shield the external magnetic field ??
good question -use google
Thanks for making your lectures available.
Thank you for your contribution to worldwide science.
Wow
I have only one Thumbs Up.
Love You Sir.
Long Live
He is the gift that keeps giving.. if you dont love him, see your cardiologist!.. you don't have a heart!!!
:)
Walter Lewin for physics and Andrew Szydlo for chemistry and Matt Parker for math. Just as every teacher should be - they totally grasp you and even if you already know what they are talking about, you can not stop listening and watching.
29:41 that's the most fascinating demonstration of yours
Respect to Sir Walter Lewin from Pakistan 🙇
I love physics myself. if only i can change the attitude of my students towards physics I will be the happiest person on earth
+daniel; njuguna Make them LOVE physics and let them feel that you LOVE them too. Your enthusiasm and energy and love should be contagious. Make them laugh, make them cry, make them sit on the edge of their seats, make them stop breathing and even make them sometimes wet their pants. YES, I CAN DO ALL THAT whenever I want to.
I have tried n it is working. Thank you prof. I need more resources because some of the experiments you do are too lively n motivate students because they can associate themselves with it
yours is more lively because it is interactive and deals with real objects
Amazing experiments! U are teaching us from miles away and coming from past taking us to future. I was a impertient, ignorant teenager while this video was being recorded :)
Hello, in the laboratory I saw the following phenomenon:
A metal ball is held by an electromagnet but if the switch is opened or the source is disconnected, it remains there for a long time, it does not fall. Sometimes it happens, sometimes it doesn't, for no apparent reason.
The strangest thing is that if the voltage of the source is increased and then disconnected, the sphere is less magnetized than when the voltage was lower. The voltages are small values of 1.5 v of 3v
What could be the reason for this?
Professor Lewin, thanks for sharing all this information. Greetings from Santiago-Chile.
Thank you Professor
Inspiring teaching as always!
The lecture was really intuitive. I am here to brush up a bit haha. thanks, sir. Awesome! Very good your lectured.
Sir u are great. Ur problem solving and concept classes really help to solve the extraordinary problems of jee advance. Can u plz come with many more conceptual lectures on u tube. I really thankfull to u to blow my interest in physics Also.
Love you Dr. Sanders! 💓🔭
I'm Indian guy who watch this lecture 👍
Your lectures are very colourful .
You make teaching a science.
Epic lecture sir
:)
Dear professor, do you have any plans in doing some content in theoritical physics? I would love to see an overview of physics like a guideline for those that gone through your lectures and wants to dive into physics more but does not know where to start.
Let me tell you that your lectures are truly amazing and i really miss them when i can't find one in a topic i am currently working on.
I retired in 2009. Use MIT OCW and edX for lectures on theoretical Physics,
When the bolt cooled down, would it be more magnetic than before? I’m guessing it would since the atoms are in a magnetic field as they stop moving.
Best demonstration
thank you
Now I m very much cleared about ferromagnetism
He. Is great, love these lectures
Congratulation for excellent presentation!
Wow 🤩🤩 awesome thanks sir for making physics interesting 😊
How current depends on loudness created by change in domains direction? Is it because of heat generated through out or any other reason? Please anyone having answer ,Respond.
What was that around 6:06 - 6:07 where the pink chalk is kept. Notice carefully with minimum playback speed.
Ya I noticed it
thank you so much
Really outstanding
Congratulations for the 500000 followers
Electric is the effect of magnet or Magnet is the effect of electric ?
magnetism is the result of the Lorentz contraction of moving charges (thus curretns) - use google
Thank you for this amazing lecture and the so many others :) I am actually a master student (in Tunisia) and i would like to know if you have any suggestions on books or lectures about ferromagnetism paramagnetism and diamagnetism on microscopic scale ?
search the web
ok i will :)
Awesome explanation 👌👍👌👍👏👏
Amazing
Respected sir, at time 9:03 you said that 'all materials when you exposed them to an external magnetic field will to some degree oppose the external magnetic field. However, in the case of paramagnetic materials, the induced magnetic dipoles are such as to increase the external magnetic field. Here, I am confused about the phrase 'all materials'.
listen again to what I said 9:03
So beautiful explanation sir.Sir i am here due my sir biswajeet
Dear sir, What is your view on the existence of God and spirituality 🙏
I am an atheist
@@lecturesbywalterlewin.they9259 Respected sir, i like too much the way you teach physics. You are a great teacher of physics. I am a PGT physics teacher in Bihar state India. One thing i would like to know from with honestly what tis the cause of all causes and the living sprit in every creature and the source of Consciousness? Can somthing be created from nothing? What is the primordial cause of universe? Big bang theory is model or reality? If i asked you too much then forgive me 🙏 have you ever read vedas and upnisad or srimadbhagwatam and Gita? 🙏
@@amreshkumar8730 He already answered all your questions in his only response to you. Everything you asked is right there. I suggest you go to some websites that don't cater to your belief or work backwards from a conclusion if you want objective answers to your questions. If your goal is to use those questions to bring any intelligent being around to your beliefs, you are waisting your time.
That was lovely thank you
Excellent lecture Sir 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏
Thanks and welcome
A women, Chinese, won a tech competition and she is also so beautiful.......
My concepts are changing........
this is amazing, thank you professor!
:)
what an honor professor! Are you the real Walter Lewin!?
Why the rotor made by Jung Eun doesn’t oscillate like in the case of rectangular circuit shown in The Torque lecture?
May be you can try an oscillating pendulum with a french Franc and a candle. It was a pure nickel coin for a few years and hence a common display
sir electron moves around the the nucleas. when the magnetic dipole moment due to this motion of the electron the magnetic moment of the atom = current *area of the orbit in which electron is moving. sir electron also spin is there will be magnetic dipolemoment associated with this motion of the electron.
use google
Inspiring preparations and demos Professor! Well Done & awesome!!
great lecture, thank you, sir,
how did the winning motor stop the current for half of the rotation?
Sir if a magnet and a coil are moving with uniform velocity in same direction then what emf became produced in coil
if magnet and the coil move jointly in the same reference frame (same velocity) then there will be no dphi/dt thus no EMF - watch my lectures
Thank you very much sir
@8:30 Why it is the area A that is the vector rather than the current I in the formula for magnetic moment?! I see current having the direction, rather then a surface.
Great Lecture from a great Prof.
Sir what is hysteresis loss????
Thank you , now i understand
Sir, I am not having Gaincoli's physics for scientists and engineers instead I have physics for scientists and engineer by Serway and Jewett. Is it okay to solve problems from it. It has topicwise problem set at the end of each chapter. So, should I solve those topicwise problem after watching the lecture of a certain topic?
Sir how when the magnetic dipole moment of atom is aligned with the external magnetic field than atom has minimum potential energy
yes, but classical physics is insufficient to handle this properly. QM is required.
Professor Lewin, in this lecture you stress repeatedly that the poles of the magnet need to have a nonuniform field for the ferromagnetic material to have an effect and have a stronger field than the vacuum field. Could you elaborate on this please?
use google
great