What was that demonstration I saw on Tv a few years ago? They had a spinning disc of aluminum and brought a magnet close to it. Either way they held it, south pole or north pole, there was an evident force of repulsion. Can anyone explain this to me?
I would like to reproduce the experiment to see if RPMs would have an effect on the magnetic force?
If you can't refute the experiment or, don't know what you are talking about, please keep your cotton-picking fingers out of my face!
Answers:
1What you observed was a demonstration which used a magnet to induce eddy currents in the spinning aluminum disk, i.e. the free charges in the aluminum, moved within the field of the magnet when the disk was spun, and the magnetic field which was then resulted from the induced currents then fed back to resist and interact with the original magnetic field. Since the currents and then the return-field are induced by the original magnet, the poliarity of the primary magnet makes no difference, because an opposing field is induced in either case.
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