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Standard XII
Physics
Lenz's Law
Question

A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. Then, the acceleration of the falling magnet (neglect air resistance) will be
  1. equal to g
  2. less than g
  3. greater than g
  4. zero

A
less than g
B
equal to g
C
greater than g
D
zero
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Solution
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As the magnet falls the flux through the ring changes. Regardless whether the flux increases or decreases, by Lenz's law a current is induced in the ring that opposes the change in flux. This induced current induced a magnetic field that interacts with the falling magnet and decreases the acceleration of fall below g.

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