Eddy Currents Are Mind-Boggling [Video]

Submitted by: sewermonkey 8 years ago in Science

I don"t know how this works or who Eddy is, but I love his physics!
There are 33 comments:
Male 21
nice lol
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Male 80
I actually know how this works , lol. The "nut" is actually a magnet, the pipe is copper, a non-ferrous metal, so it wont be attracted to, or by the magnet. However, copper, when in the presence of a moving magnetic field will generate an electrical current, or in this case, an opposing magnetic field, slowing the descent of the magnet through the pipe. Kids, try this at home.
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Male 97
dairy is a retard, go back to reading tabloids and watching britains got talent you lame fag
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Female 376
omg this is cool ^^
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Male 3,915
that....was....so....cool...
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Male 3,296
they looked like magnets
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Male 599
"so....what exactly was cool about that video? like...did anything special happen to the nut as it fell down the pipe??"

Are you really that stupid? the nut slowed down. God pay attention or just go to e baums world or something

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Male 381
so....what exactly was cool about that video? like...did anything special happen to the nut as it fell down the pipe??

I really dont understand physics...

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Male 69
http://www.youtube.com/watch?v=fxC-AEC0R... the same effect but reversed, big magnet (MRI) and aluminium block.
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Male 109
>can you use any copper tube?

you need any tube that can conduct electricity in a loop around its circumference. Copper is one such material.

The harder thing to get, really, is an appropriate magnet to drop down the tube.

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Male 413
can you use any copper tube?
i wanna try this
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Male 109
>It can`t actually stop it though, since if it did there would be no current and therefore no field to hold it.

Correct. This is the same reason that induction motors always run at a speed that is slower than the rotating magnetic field.

>opie

To be fair, this is deep enough into the minutiae of electromagnetism that you really need vector math to describe what is going on.

And when you dive into vector calculus, you find funny things such as integrating the curl of a field around a perimeter, and the integrating the flux of the same field through a surface bounded by that perimeter, and getting the same answer.

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Female 15,763
Aaaand this is why I`m bad at physics.

o_O

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Male 416
Sweet! Its the leftover charge from a solenoid isn`t it?

If I remember from college, the falling magnet induces current in the copper tube. That current creates a magnetic field which tries to stop the magnet falling. It can`t actually stop it though, since if it did there would be no current and therefore no field to hold it.

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Male 277
hurra for magnets and their awsome slomo falling levitating abilitys
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Female 1,412
looks like magnets
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Male 844
Sweet! Its the leftover charge from a solenoid isn`t it?
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Male 220
Yes, neudynium magnets: http://en.wikipedia.org/wiki/Neodymium_m...

My favorite demonstration of eddy currents was the director of a company that makes MRI`s in England. He took an aluminum disk (aluminum is not a ferro magnet so you can bring it into strong magnetic fields), put it upright inside the MRI chamber then let it go. It fell in slow motion because of eddy currents.

Now do you know why Magneto was the most powerful mutant in the X-men universe? :-)
(I know, I know, he wasn`t, but it was a good ending line for me)

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Male 436
@ Randy: Didn`t see his nose, don`t know if it`s a carrot or not!

Ontopic: That was pretty awesome.

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Male 62
ive done that before ecept it was my friend and giant kiddyslide.....nah not really i just wanted to feel special but thats still awesome
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Female 2,120
@RandyTheFool
Does he weigh the same as a duck?
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Male 17,512
This is sort of related to this.
Floating Magnet
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Male 543
thats cool :DD
is it magnets?
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Male 817
D3: "WHAT THE SH*T?
WITCH!
KILL IT WITH FIRE!"

How do you know he`s a witch? Did he turn you into a newt (and then you got better)?

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Male 5,189
*Watches it 3 times*

Awesome.

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Female 299
Magic O.o
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Male 722
WHAT THE SH*T?
WITCH!
KILL IT WITH FIRE!
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Male 55
:o Get Eddy out of the tube`s time space continuum!
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Male 82
It works because the matter of the tube resists the change in the immediate magnetic field by creating an opposing one. It`s similar to a drag force!
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Male 1,064
:o that was kinda cool actually.
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Female 3,696
...He`s a witch! Throw him into the pond!
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Male 1,220
WOAH........WOAH
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Male 281
Link: Eddy Currents Are Mind-Boggling [Video] [Rate Link] - I don`t know how this works or who Eddy is, but I love his physics!
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