Metal Ball
January 2nd, 2010
Is it possible to induce an electric current in a metal ball?
I know that if you have a coil, it creates a magnetic field that will create an electric current in another coil next to it. I was wondering if you could create an electric current using the same method but in a metal ball instead.
Yes of course you can. If you bring a coil near to a piece of metal (of any shape) then it can induce currents in the metal object. These kind of currents induced in a solid- or sheet- metal object are called “eddy currents”. The main condition to be met is that the magnetic field applied to the metal ball by the coil, must be varying, either because the coil is moving or because the current supplied to the coil is varying (e.g. AC).
Fushigi Ball Trick with Big Metal Balls
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