Nice. You should try another video with the can rotating at high speed on a near frictionless surface and put the magnet over it. The eddy currents should make it slow down much faster than normal. Or hang the can from a string, spin it and have the magnet under it. Again, it should slow down in a much shorter time than a can without a magnet would.
maybe it it the wind you produce moving your hand back nad forwards, and the wind moves the can? and because the can is really light it doesn't need a lot of wind to move.. dumb idiot -.-
This is pedagogically poor from the point of view of scientific education. Just suppose that induction was not already an accepted phenomenon. Then this experiment would be worthless because the alternative explanation, that the movement is caused by air currents, has not been ruled out.
I bought a ring that's magnetic and dropped it down stainless metal tubing with the tubing in the middle if the ring i.e. the magnet was on the outside. Unfortunately it didn't slow down, dropped like a rock. Isn't this the same principal or does the magnet have to be in the center?
@catchpen The magnetic field from the magnet must pass perpendicularly through the metal for maximum effect. In your case, the donut magnet probably has North and South poles on its faces, which means a lot of it's flux goes outside the center, not inside. Furthermore, the magnetic flux lines mostly pass parallel through the metal tube, not perpendicular.
@BTCInstrumentation Thanks for the reply. Hey I got it to work :) , check out my profile for the video sorry for the poor quality. We found a solid bronze rod and it worked. I guess the hollow tubing wasn't a good "conductor".
@BTCInstrumentation Thanks for the reply. Hey I got it to work :) , check out my profile for the video sorry for the poor quality. We found a solid bronze rod and it worked. I guess the hollow tubing wasn't a good "conductor".
@catchpen Cool! A solid metal rod has more cross-sectional area for eddy currents than a hollow tube. This makes the most of a non-ideal arrangement.
I've seen a similar experiment where a small spherical magnet was dropped INSIDE a copper tube, and the speed of its fall was greatly inhibited by the effect of Lenz's Law.
@catchpen I saw some answers... they are not correct. The reasons for no slow down in your case are:
1. Stainless steel has MUCH higher resistense than even mild steel. Sure, the difference stainless steel/copper will be even higher. So the eddy currents will not be sugnificant.
2. Another reason is that these guys are using not just magnets from the store; but really poverful Neoudim magnets
@uawwildbob Lenz's Law is applicable to ANY conductor of electricity. So long as the metal is electrically conductive (which all metals are), Lenz's Law applies. The effect, of course, is weakened for metals having high specific resistance because that electrical resistance opposes the induced currents.
after you pull the magnets away what makes the can continue to rock back and forth? I can understand if it continued in one direction, but to stop and start moving in another direction indicates another force other then your magnetic field.
@eldante01 The table isn't completely flat, nor is the can perfectly round. Prior to shooting the video, I had to find a spot on the table where the can would not continue to roll, and I found one where the can would end to settle back to the same place because of the unevenness.
could this be the wind created from your hand passing overhead. its not that i doubt you on Lenz's law but i can do the same thing just the same but with no magnets. thanks for the vid.
I probably should have passed my hand next to the can at the same speed to prove it's actually Lenz's Law and not air movement from my hand that's moving the can. Maybe I'll re-shoot this video . . .
do it in a vacuum chamber with no wind, then I'll believe it
SpindlyOsprey 6 days ago
Nice. You should try another video with the can rotating at high speed on a near frictionless surface and put the magnet over it. The eddy currents should make it slow down much faster than normal. Or hang the can from a string, spin it and have the magnet under it. Again, it should slow down in a much shorter time than a can without a magnet would.
subductionzone 4 months ago
CLEARLY HE SOLD OUT AND HAS AD PLACEMENTS IN VIDS!!!
/end troll
TxColter 4 months ago
maybe it it the wind you produce moving your hand back nad forwards, and the wind moves the can? and because the can is really light it doesn't need a lot of wind to move.. dumb idiot -.-
Yahuzi 4 months ago
@Yahuzi Yes, while Lenz's Law is a real effect, this particular demonstration isn't very good for the reason you stated.
ChrisGranger 3 months ago
Where is a whiteboard when you need one! I need to visualize these fields NAOW!
SpazzyMcGee1337 5 months ago
that is because the aluminium can is not 100% aluminum. it has a small percentage of iron and other magnetic-attracted metals.
william69952 5 months ago
0:12 However, if I take the magnet and hold it next to my laptop....
sjonessonejs 6 months ago
this is awesome it even works with out the magnet!
KaylinJH 6 months ago 2
If you Mute the sound and just see what he's doing (without the long talking) it would look way simpler. - a magnet attracts aluminum can- No Shit!
smartzazi 8 months ago
i think its the wind from your hands that makes the aluminium moving . . .
stevenliang96 8 months ago
@stevenliang96 its not.
molitatron 6 months ago
rockstar is gross
a4d2d0 1 year ago 2
This is pedagogically poor from the point of view of scientific education. Just suppose that induction was not already an accepted phenomenon. Then this experiment would be worthless because the alternative explanation, that the movement is caused by air currents, has not been ruled out.
flowerbower 1 year ago
so if u can spin the magnet at high speed and past the aluminum can, will the can fly out in one direction?
sammytsai 1 year ago
I bought a ring that's magnetic and dropped it down stainless metal tubing with the tubing in the middle if the ring i.e. the magnet was on the outside. Unfortunately it didn't slow down, dropped like a rock. Isn't this the same principal or does the magnet have to be in the center?
catchpen 1 year ago
@catchpen The magnetic field from the magnet must pass perpendicularly through the metal for maximum effect. In your case, the donut magnet probably has North and South poles on its faces, which means a lot of it's flux goes outside the center, not inside. Furthermore, the magnetic flux lines mostly pass parallel through the metal tube, not perpendicular.
BTCInstrumentation 1 year ago
@BTCInstrumentation Thanks for the reply. Hey I got it to work :) , check out my profile for the video sorry for the poor quality. We found a solid bronze rod and it worked. I guess the hollow tubing wasn't a good "conductor".
catchpen 1 year ago
@BTCInstrumentation Thanks for the reply. Hey I got it to work :) , check out my profile for the video sorry for the poor quality. We found a solid bronze rod and it worked. I guess the hollow tubing wasn't a good "conductor".
catchpen 1 year ago
@catchpen Cool! A solid metal rod has more cross-sectional area for eddy currents than a hollow tube. This makes the most of a non-ideal arrangement.
I've seen a similar experiment where a small spherical magnet was dropped INSIDE a copper tube, and the speed of its fall was greatly inhibited by the effect of Lenz's Law.
BTCInstrumentation 1 year ago
@catchpen I saw some answers... they are not correct. The reasons for no slow down in your case are:
1. Stainless steel has MUCH higher resistense than even mild steel. Sure, the difference stainless steel/copper will be even higher. So the eddy currents will not be sugnificant.
2. Another reason is that these guys are using not just magnets from the store; but really poverful Neoudim magnets
Aleksandr2975 6 months ago
@Aleksandr2975 Sorry, I did not get it first - if magnet is outside of the tubing, that changes everything.
Aleksandr2975 6 months ago
good post . lens law still has room for experimentation. are there any nonmagetic metals that are not effected by lens law ?
uawwildbob 1 year ago
@uawwildbob Lenz's Law is applicable to ANY conductor of electricity. So long as the metal is electrically conductive (which all metals are), Lenz's Law applies. The effect, of course, is weakened for metals having high specific resistance because that electrical resistance opposes the induced currents.
BTCInstrumentation 1 year ago
after you pull the magnets away what makes the can continue to rock back and forth? I can understand if it continued in one direction, but to stop and start moving in another direction indicates another force other then your magnetic field.
eldante01 1 year ago
@eldante01 The table isn't completely flat, nor is the can perfectly round. Prior to shooting the video, I had to find a spot on the table where the can would not continue to roll, and I found one where the can would end to settle back to the same place because of the unevenness.
BTCInstrumentation 1 year ago
Rockstar product placement shenanigans.
schnappy00 1 year ago
isnt that air draft from moving your hand back and forth?
alienpatentoffice 1 year ago
Never respond to a debunker, they'll have you jumping through hoops forever
metalminded 1 year ago
Magnets are not attracted nor repelled by aluminum. But, they do cause drag when moved across the aluminum surface
shortyskaraoke 1 year ago
could this be the wind created from your hand passing overhead. its not that i doubt you on Lenz's law but i can do the same thing just the same but with no magnets. thanks for the vid.
mashedfireflys 1 year ago
I probably should have passed my hand next to the can at the same speed to prove it's actually Lenz's Law and not air movement from my hand that's moving the can. Maybe I'll re-shoot this video . . .
BTCInstrumentation 1 year ago
Thanks for the video.
bulgariaisnomberone 2 years ago
Excellent !
clagwell 2 years ago
very good explanation :B
gaussman08 2 years ago