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Are you really that stupid? the nut slowed down. God pay attention or just go to e baums world or something
I really dont understand physics...
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.
Correct. This is the same reason that induction motors always run at a speed that is slower than the rotating magnetic field.
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.
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.
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)
Ontopic: That was pretty awesome.
How do you know he`s a witch? Did he turn you into a newt (and then you got better)?