This channel is spectacular. I was told about the noise from magnetic domains 20 years ago from a physics teacher. This is the first time I've ever seen it demonstrated. Thank you!
So this also explains why iron peices become a tiny bit of magnetic after you put a magnet to it. If even just a small part of all the magnetic domains in the iron get pointed into the same direction, it creates enough of a magnetic field to be noticeable. Thank you for making me finally understand this.
Great follow up on your induction heating '"series"! This is essentially the same thing what happens when you put your superconductor in an (induction heater) AC field. Though the specific physics in play are somewhat different in nature, they are quite similar in practise.
The thought of hearing changing magnetic field never once crossed my mind , it blew my mind that the thing was always simple as even highschool level study can explain but I never tried
I did not know that the Barkhausen effect added to the fast heating of iron but it makes sense! I further did not know that the Curie temperature reduced the effect!
It feels awesome to be 1 minute and 42 likes early on one of your videos man but I just want to let you know that I’ve been a supporter for a couple years now,and that I love your videos, they are are very informational, creative, and inspiring.
I've never seen an induction cooktop in person, but I don't think that I would put my hand on it soon after removing a heated pot or pan. I think the surface would still be hot from being in contact with the utensil.
Its not hot, its a little warm at most and you wudnt be able to keep your hand on it for a long time, but a couple seconds wudnt feel hot... At least not to hands of those of me or the cooks ive learned from; but ofc we may have higher heat tolerance there, tho ill add weatherwise my heat tolerance is to like 80f/27c, but i can usually stick my finger in a hot sauce and pull it out and taste the sauce without it burnin me in any way
Officially, this is what folks who review induction stoves say about it... "There might be some residual heat from the cookware if you’ve just cooked something on it. This residual heat usually dissipated quickly but is still something to keep in mind. So it’s best to not touch the cooking zone right after using it (it only takes a few seconds to cool down though)" So like, yea its still slightly hot when youve just finished cookin, but shockingly not so hot its likely to burn unless you rly quickly put your hand down and are sensitive to heat.
Incredible demonstration. Being able to hear the microscopic flips of magnetic domains inside of a ferromagnetic metal. You've outdone yourself once again !
Right? All you gotta do is use them to manipulate an electric current, amplify the signal, send it through a coil that manipulates another magnet which in turn pushes a third magnet, and attach a cone to the third magnet covering it's motion in sound waves. Yep. You take magnetic energy. convert it to electric, boost it, convert it back into magnetic energy, which then creates kinetic energy, and that kinetic energy is then converted into sound. I suppose this works with anything that has a magnetic field. Come to think of it, without all that electricity, extra magnets, cone, etc, the domains don't seem to make much noise at all.
This has almost nothing to do with the video itself, but just thought of leaving it here in case someone is thinking of buying an induction cooktop - don't be careful only about the material your pots and pans are made of - the other very important often overlooked thing is how flat they are in the bottom area that is going to make contact with the induction cooktop. Preferably, just buy sets of pots and pans that are specifically made for induction cooktops, so you have some guarantee that the material and shape is optimized for it. From experience - I use induction cooktops, and I have bought once and have seen a whole ton of cases of generic frying pans and pots being sold as "works with induction cooktops" with it not actually being recommended by the manufacturer. What happens sometimes is that it actually won't work or will work very poorly because the material (usually some sort of alloy) isn't great for it, or because the bottom of them have weird inlays, detailed working, shapes and whatnot that makes them not align properly with the induction coils. Check the bottom and see if it's flat and doesn't have a lot of indents and detailed engravings.
I find it funny how the process of recording the sound goes through multiple coils of wire. Wire on the spool -> Coil in the speaker -> Coil in the microphone.
I guess I have learned this in school somewhat years ago, induction wasn’t that big in the kitchens yet… I never have seen this visualized in such a cool way! 👌👌😎
I guess it could be possible but incredibly difficult. Basically you would have to grow a single crystal of iron. You can do it for other elements like diamond with very low number of defects.
@@manpreet9766 and a defect is a misalignment or, well, defect, in the crystal lattice. It is not an impurity, unless you call "nothing" impure. I.e, you want: Fe Fe Fe Fe Fe. ... but your get Fe Fe Fe Fe....
Great vid as always. Thanks for clarifying this so well. Great detail. Man, can I use some subscriptions. Free (or almost) stuff is nice when I'm already making videos to share to show others how to save things from the dump or recycling heap.
If you heat the iron bar red hot and then quench it in water real fast the flipping of the magnet trick won't work anymore. This is because you have hardened the iron thus locking the molecules into one position and they don't want to be changed/flipped.
Idk if you can even calculate this but I’m curious about skipping stones on water like what is the maximum amount you can skip with the most ideal rock and water condition
I would really like to hear the sound of that ring of magnets on the motor spinning up as it caused noise from flipping the domains 3:55. I really wanna know what that would sound like.
Firstly, metals heat up when electrons bump into the positively charged cation cores in the metal releasing kinetic energy as thermal energy. So I am hypothesizing the Barkhausen effect adds to the kinetic energy of iron atoms because the magnetic fields push the atoms or "clumps of atoms" around which further dissipates it as thermal energy.
If this is true then the Barkhausen effect would work with higher temperatures and it does not so i don't think that's it. It is as said in the video the friction between the changing domains and the defects in the iron. And my speculation is that it is electrons bumping into electrons that causes this friction.
@@vladyjokey5790 That makes sense. The friction adds to the heat. However at higher temperatures, magnetic fields are not as effective so there should be a decrease in the amount that the Barkhausen effect has in changing the domains around.
@@westonding8953 Yep, it would be interesting to see how a really strong magnetic field influences and to what degree the iron domains at higher temperatures
Idea: show how a tension force can extend infinitely if you pull perpendicular on a rope. For example taking a rope tied to a tree then tying that to a car/truck and pulling perpendicular from the center of the rope and showing how easy it is pull the vehicle.
I wasn't following your explanation until you placed the iron core in the coil of copper, magnetized the core slightly and demonstrated how the noise was not present... then flipped the magnet and it was present. Great explanation. The one thing I don't quite understand is why doesn't the rapidly oscillating magnetic field of the induction heater cause a 60 ? hz signal in the speaker?
The signal at 4:48? It's there, the loud buzz. He could've done a control demonstration for better understanding, putting the copper coil near the operating induction heater but without iron, so the 60 Hz would be heard pure, without the raspy frequencies.
*Experiment idea:* Connect 2 "balls" (or other shapes) of various density/materials and "connect" them via a "stick" of various materials (conductive and non-conductive) and drop them in a vacuum chamber! If you do, please use a camera with a high FPS-rate, slow it down and try to get a close shot from a short distance. 🙂👍
This was neat. You’ve nearly created a guitar pickup. Just sub the iron for a magnet and you will be able to pick up vibrations in a magnetic material.
Is this kinda the process of magnetic pickups in electric guitars. If the magnet was inside the copper coil would the vibration of the guitar string cause a change in the magnetic field and be output as sound through the amplifier?
I almost feel like I was neglected in regards to maybe using something DIY audio or other spectrum analyzer to show the actually frequencies of the RF coil (induction heater_... I guess not so much inside differences.
It's above the Curie temperature well before it melts, so it cannot retain its magnetism. If you want it to be magnetic again when it cools back down, you need to apply an external magnetic field to align the domains again.
By the way the curie temperature rod iron is above 700c so the effect on cooking is not significative, and iron. Keeps its advantage during the cook process
Since steel is at the correct temp for tempering when it loses it's magnetism. I wonder how that effect is related in the tempering of steel, like in knife making?
What frequency does the induction heating coil power supply put out? According to the Wikipedia article on induction stoves, most of them work at 24 KHz to 40 KHz, but "all-metal" units have been made that work at 60 KHz to 120 KHz.
Good, but the magnetic domains part is the more interesting part. You kinda can easily relate to the microphone working because we can also _feel_ and _see_ vibrations that soundwaves impose on material and connect it with knowledge that vibrating a magnet near a coil induces current in it (2:30)... but we can't sense magnetic domains flipping by our receptor organs at all, and yet the induced current in the coil gives a hint that that's what's happening.
The step where you do the with and without the iron is a bit careless because the inductance of the coil is changed. IR coils are often made with powdered iron just to avoid the effect. So a better experiment would have be to use the iron bar and a powered iron core that gave the same inductance. You would the same effect but would reduce one one of the variables. Good stuff.
This was my entire ferromagnetic class that you explained in just 6 mins... That's the power of a good teacher... Thanks and keep going! ❤️👍🏻
Wow, are you joking, or is this video enough as notes for ferromagnetic class
@@sillicon8227 well I'm a visual learner so doesn't depends on notes....
@@ankurraj6560 At some point, some things cannot be visualized.
@@westonding8953 i don't want to go to that point.... Better I'll push to learn visually as far as possible!
@@ankurraj6560 Sounds reasonable. Higher dimensional math cannot be visualized at a point. Still worth learning if it interests you.
Awesome demonstration of the domains snapping into place - I will definitly integrate that experiment it into my curriculum. :) Thank you!
This channel is spectacular. I was told about the noise from magnetic domains 20 years ago from a physics teacher. This is the first time I've ever seen it demonstrated. Thank you!
So this also explains why iron peices become a tiny bit of magnetic after you put a magnet to it.
If even just a small part of all the magnetic domains in the iron get pointed into the same direction, it creates enough of a magnetic field to be noticeable.
Thank you for making me finally understand this.
You can magnetize a nail by stroking it in the same direction with another magnet similarly
You can magnetize a nail by stroking it in the same direction with another magnet similarly
Although i knew all this stuff beforehand, your teaching capability made me smile throughout the video
Great explanation
Humble brag ;)
How'd you know this beforehand?
@@satvikvarun6386 school probably
@@totallyaccuratechannel ...or UA-cam :)
Man... The demos on this channel are some of the best out there.
yeah, this one was really cool!
Sick, these uploads are the only time that I enjoy someone teaching me something
Great follow up on your induction heating '"series"! This is essentially the same thing what happens when you put your superconductor in an (induction heater) AC field. Though the specific physics in play are somewhat different in nature, they are quite similar in practise.
Wow this was incredibly informative, clear and visually demonstrated what is going on in the science really well. Good work!
You are an excellent experimenter! Rocks with digging deeper in the subject. Very important vedeo indeed!
The thought of hearing changing magnetic field never once crossed my mind , it blew my mind that the thing was always simple as even highschool level study can explain but I never tried
I did not know that the Barkhausen effect added to the fast heating of iron but it makes sense! I further did not know that the Curie temperature reduced the effect!
your vids are the best man!
WOW! What a great demonstration. I never would have guessed that'd happen.
missed opportunity to say: I never would have gaussed that'd happen. get it? Gauss-ed
It feels awesome to be 1 minute and 42 likes early on one of your videos man but I just want to let you know that I’ve been a supporter for a couple years now,and that I love your videos, they are are very informational, creative, and inspiring.
It's precisely my comment on you last video about induction heating, hope I participated to pick this subject!
2:50 *This is how they made Music Disc 13 in Minecraft.*
I've never seen an induction cooktop in person, but I don't think that I would put my hand on it soon after removing a heated pot or pan. I think the surface would still be hot from being in contact with the utensil.
Its not hot, its a little warm at most and you wudnt be able to keep your hand on it for a long time, but a couple seconds wudnt feel hot... At least not to hands of those of me or the cooks ive learned from; but ofc we may have higher heat tolerance there, tho ill add weatherwise my heat tolerance is to like 80f/27c, but i can usually stick my finger in a hot sauce and pull it out and taste the sauce without it burnin me in any way
Officially, this is what folks who review induction stoves say about it...
"There might be some residual heat from the cookware if you’ve just cooked something on it. This residual heat usually dissipated quickly but is still something to keep in mind. So it’s best to not touch the cooking zone right after using it (it only takes a few seconds to cool down though)"
So like, yea its still slightly hot when youve just finished cookin, but shockingly not so hot its likely to burn unless you rly quickly put your hand down and are sensitive to heat.
literally my 12th grade Moving charges and Magnetism chapter in 1 video. Very useful practical demonstration. Will show my friends this video.
The lack of noise at high temperature is propably caused by crossing the Curie point of iron, which causes material to loss magnetic properties
Incredible demonstration. Being able to hear the microscopic flips of magnetic domains inside of a ferromagnetic metal.
You've outdone yourself once again !
Excellent demonstration, thanks!
You can hear changing magnetic domains. So cool when you put it that way.
Right? All you gotta do is use them to manipulate an electric current, amplify the signal, send it through a coil that manipulates another magnet which in turn pushes a third magnet, and attach a cone to the third magnet covering it's motion in sound waves.
Yep. You take magnetic energy. convert it to electric, boost it, convert it back into magnetic energy, which then creates kinetic energy, and that kinetic energy is then converted into sound.
I suppose this works with anything that has a magnetic field. Come to think of it, without all that electricity, extra magnets, cone, etc, the domains don't seem to make much noise at all.
That coil part with the amp was explained very well! Its similar to how guitar pickups work.
This has almost nothing to do with the video itself, but just thought of leaving it here in case someone is thinking of buying an induction cooktop - don't be careful only about the material your pots and pans are made of - the other very important often overlooked thing is how flat they are in the bottom area that is going to make contact with the induction cooktop.
Preferably, just buy sets of pots and pans that are specifically made for induction cooktops, so you have some guarantee that the material and shape is optimized for it.
From experience - I use induction cooktops, and I have bought once and have seen a whole ton of cases of generic frying pans and pots being sold as "works with induction cooktops" with it not actually being recommended by the manufacturer. What happens sometimes is that it actually won't work or will work very poorly because the material (usually some sort of alloy) isn't great for it, or because the bottom of them have weird inlays, detailed working, shapes and whatnot that makes them not align properly with the induction coils. Check the bottom and see if it's flat and doesn't have a lot of indents and detailed engravings.
Thank you for sharing this demonstration!
You are an outstanding communicator!!
Congratulations!
Thank you very much!
This is one of the best demonstration.
@The Action Lab
Wow thank you! I'd like to believe this was inspired by my question. Thanks for the answer; it was very interesting!
Amazing loved it
Which causes more heat: the eddy currents induced when the iron domains shift, or is it the friction resulting from hysteresis when the domains shift?
wow, I am not a science student and even I am blown away by the this and the way you've explained!
dude, this channel is really amazing! thank you so much!
"without the iron you don't hear it" speaker proceeds to make noise...
today had a conversation with my father about induction heat plates for cooking being more energy efficient and now I know why thanks
What a great teacher.
This guy can never make an uninteresting video, especially when magnets are involved
Wow that was so well explained thank you!!
this is by far the most interesting video about the Barkhausen Effect ever watched
I am fascinated by this! Thank you for sharing!
I find it funny how the process of recording the sound goes through multiple coils of wire. Wire on the spool -> Coil in the speaker -> Coil in the microphone.
This was a really good demonstration. I particularly liked the demonstration of how it totally breaks down past the Curie point :) 👍
hmm....never new about that effect. Nice video!
Wow you did it again, explaining something that I've been wondering about for years. Keep it up!
I guess I have learned this in school somewhat years ago, induction wasn’t that big in the kitchens yet… I never have seen this visualized in such a cool way! 👌👌😎
you always have the coolest/funniest shirts
Would it be possible to make iron that lacked the impurities which cause the snapping, or is that an unavoidable property of iron?
I guess it could be possible but incredibly difficult. Basically you would have to grow a single crystal of iron. You can do it for other elements like diamond with very low number of defects.
@@manpreet9766 and a defect is a misalignment or, well, defect, in the crystal lattice. It is not an impurity, unless you call "nothing" impure. I.e, you want:
Fe Fe Fe Fe Fe. ... but your get
Fe Fe Fe Fe....
@@DrDeuteron yes I know. Thanks for bringing that up. I should have mentioned in the comment but left that out just due to laziness.
@@manpreet9766 I know you know, but OP: maybe not?
This is probably the best video that you've ever uploaded.
I Love your content and am blown away often by the information you put out. But even more are blown away by how you even know all of this lol
Good Explanation!
Fun fact: you can also heat or melt chopper with inducction heating, but you require a very fine tuned machine with a coil that can manage the current
I'm glad I clicked this video. It was always confusing to me the difference of stoves. Note to self, get an induction oven!
Good quality sound from the fender amp
valance electron spin direction. That’s what makes iron special in terms of magnetism
Great vid as always. Thanks for clarifying this so well. Great detail. Man, can I use some subscriptions. Free (or almost) stuff is nice when I'm already making videos to share to show others how to save things from the dump or recycling heap.
Best demo of ferromagnetism I ever saw. I need to remember that.
If you heat the iron bar red hot and then quench it in water real fast the flipping of the magnet trick won't work anymore.
This is because you have hardened the iron thus locking the molecules into one position and they don't want to be changed/flipped.
Wow, fantastic video! Very good explanation.
Idk if you can even calculate this but I’m curious about skipping stones on water like what is the maximum amount you can skip with the most ideal rock and water condition
I would really like to hear the sound of that ring of magnets on the motor spinning up as it caused noise from flipping the domains 3:55. I really wanna know what that would sound like.
Great video 👍
Firstly, metals heat up when electrons bump into the positively charged cation cores in the metal releasing kinetic energy as thermal energy. So I am hypothesizing the Barkhausen effect adds to the kinetic energy of iron atoms because the magnetic fields push the atoms or "clumps of atoms" around which further dissipates it as thermal energy.
If this is true then the Barkhausen effect would work with higher temperatures and it does not so i don't think that's it. It is as said in the video the friction between the changing domains and the defects in the iron. And my speculation is that it is electrons bumping into electrons that causes this friction.
@@vladyjokey5790 That makes sense. The friction adds to the heat. However at higher temperatures, magnetic fields are not as effective so there should be a decrease in the amount that the Barkhausen effect has in changing the domains around.
@@westonding8953 Yep, it would be interesting to see how a really strong magnetic field influences and to what degree the iron domains at higher temperatures
Idea: show how a tension force can extend infinitely if you pull perpendicular on a rope. For example taking a rope tied to a tree then tying that to a car/truck and pulling perpendicular from the center of the rope and showing how easy it is pull the vehicle.
I wasn't following your explanation until you placed the iron core in the coil of copper, magnetized the core slightly and demonstrated how the noise was not present... then flipped the magnet and it was present. Great explanation. The one thing I don't quite understand is why doesn't the rapidly oscillating magnetic field of the induction heater cause a 60 ? hz signal in the speaker?
The signal at 4:48? It's there, the loud buzz.
He could've done a control demonstration for better understanding, putting the copper coil near the operating induction heater but without iron, so the 60 Hz would be heard pure, without the raspy frequencies.
Wow! That's why the induction kitchen turns off out of the sudden and then gets hot again! Because the iron has reached the heating capacity 🤯
been learnin this shyt in school recently and you explained it alot better than mah teach.
This is incredible!
Very good analysis
Thank you, it was wonderful explaination
Lets do a clean up campaign
Just report all bots in comments section
I dont know if youtube does anything
*Experiment idea:* Connect 2 "balls" (or other shapes) of various density/materials and "connect" them via a "stick" of various materials (conductive and non-conductive) and drop them in a vacuum chamber! If you do, please use a camera with a high FPS-rate, slow it down and try to get a close shot from a short distance. 🙂👍
Very nice experiment!
You have Just connected some stuff i knew together for this video, i am Always leraning Something new from you
This was neat. You’ve nearly created a guitar pickup. Just sub the iron for a magnet and you will be able to pick up vibrations in a magnetic material.
Will be able? Heck that's what he already did 2:30
"sudden change" = "vibrations in a magnetic material"
Thanks!
Is this kinda the process of magnetic pickups in electric guitars.
If the magnet was inside the copper coil would the vibration of the guitar string cause a change in the magnetic field and be output as sound through the amplifier?
yes, when you vibrate a magnet inside the coil it is very loud on the speaker
such a great channel
Good for blacksmith furnace
I almost feel like I was neglected in regards to maybe using something DIY audio or other spectrum analyzer to show the actually frequencies of the RF coil (induction heater_... I guess not so much inside differences.
Cool video! What happens to a magnet when it melts under high heat?
It's above the Curie temperature well before it melts, so it cannot retain its magnetism. If you want it to be magnetic again when it cools back down, you need to apply an external magnetic field to align the domains again.
@@Moejoe647 correct. you can't melt a magnet, it loses its magnetism before it melts.
@@volvo09 That is a clever statement. You cannot melt a magnet but you can melt something that was a magnet.
Female magnet : "All I did was get a little overheated and suddenly Im not attractive anymore."
that was a really good experiment!
By the way the curie temperature rod iron is above 700c so the effect on cooking is not significative, and iron. Keeps its advantage during the cook process
Idk why this amuses me so much. Like a signal tracer from the old days
Since steel is at the correct temp for tempering when it loses it's magnetism.
I wonder how that effect is related in the tempering of steel, like in knife making?
2:30 that's how guitar pickup works
I would love to see what austenitic stainless would react like.
What frequency does the induction heating coil power supply put out? According to the Wikipedia article on induction stoves, most of them work at 24 KHz to 40 KHz, but "all-metal" units have been made that work at 60 KHz to 120 KHz.
Great demonstration but what if you put the iron bar in liquid nitrogen? Would the sound be louder?
You could make some sick electronic music with magnets.
So cool! I wish I had nothing to do... I'd be your official fulltime camera man and editor just to be around this awesome stuff and help out.
Hard-core
Nice experiments ... Keep it up
Science is so cool!
He almost explained how microphones work. :o
Good, but the magnetic domains part is the more interesting part.
You kinda can easily relate to the microphone working because we can also _feel_ and _see_ vibrations that soundwaves impose on material and connect it with knowledge that vibrating a magnet near a coil induces current in it (2:30)... but we can't sense magnetic domains flipping by our receptor organs at all, and yet the induced current in the coil gives a hint that that's what's happening.
The step where you do the with and without the iron is a bit careless because the inductance of the coil is changed. IR coils are often made with powdered iron just to avoid the effect. So a better experiment would have be to use the iron bar and a powered iron core that gave the same inductance. You would the same effect but would reduce one one of the variables. Good stuff.
For the demonstration, the coil's inductance is irrelevant. He is showing the Barkhausen effect and associated noise.
The whole point was not to include iron.
Brilliant video
He has an earlier video on the Barkhausen effect. It demonstrates how electric guitars work!
- are you playing with magnets again??
+ "4:07"
This is amazing!!! 🤯🤯
lololol that red line with no information attached to give context killed me. Ooooooo red line go up.
4:10 neon light bulb music :