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Eddy Currents

by Trevor Shannon

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Here's another demonstration of eddy currents and induction. Here we have a hollow copper tube and an ordinary pencil. If I drop the pencil through here you can see how quickly it falls, and hits the ground. I also have these very strong rare earth magnets and as you can see they don't stick to the copper because copper isn't naturally magnetic material, however if I drop them through this hollow copper tube, you can see that it takes a very long time for them to fall, and there they are. The magnets fall so slowly because they induce a current in this copper tubing and it opposes the motion of the magnets falling downward So it slows the falling of the magnets.

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