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This is not an ad, just a enthusiastic recommendation from a physics
teacher who has just received a great piece of demonstration
equipment for Faraday's law (and Lenz's law). It's called Newton's
Nightmare and is only $12.95 with free shipping in the US.
Check out the video at http://www.penguinmagic.com/product.php?ID=841.
We have an older version using two parallel copper pipes and a cow
magnet, but Newton's Nightmare is much better.