Question

a bar magnet falls from height 'h' through a coppe ring. Will its acceleration be equal to 'g'?

Answer 1

Ans. No , acceleration of magnet will not be equal to g . It will be less than ‘g ‘ . This is because as magnet falls amount of magnetic flux linked with the ring changes  . An induced current is developed in the ring which opposes the downward motion of the magnet .After the magnet has crossed the metal ring , amount of magnetic flux linked with the ring goes on decreasing . An induced current is developed in the ring and opposes the fall of magnet . Therefore downward acceleration of magnet continues to be less than ‘ g ’ .

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Answer 2

Hey !!

When magnet falls, the magnetic flux linked through the metal ring changes, so current is induced in the ring which ( according to Lenz's Law ) opposes the approach of magnet, so the accleration will be less than g.

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