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A bar magnet is freely falling vertically inside a conducting ring placed in horizontal plane. Will it fall with an acceleration equal to g, less than g or greater than g?


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Hello gpuguy, Welcome to physics.SE. We generally discourage questions (from askers) that ask users to solve their own home-made problems. Perhaps, your question is like "choose the best answer" - like that kind... – Waffle's Crazy Peanut Nov 21 '12 at 17:56

2 Answers 2

up vote 4 down vote accepted

Less than g.

Since it generates energy in the conducting ring when passing through the ring, by conservation of energy, the magnet loses some kinetic energy (there are forces acting on the magnet.

See Lenz's law.

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This was the best explanation. Thanks – gpuguy Nov 22 '12 at 15:25

Here you go:
And as Raindrop said, this is predicted by Lenz's law.

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