A circular ring is fixed in a gravity free space and one point of the ring is earthed. Now a magnet is placed along axis of the ring at a distancefrom its centre such that the nearer pole is north pole as shown in figure. A sharp impulse is applied on the magnet so that it starts to move towards the ring. Then,

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Initially magnet experiences an acceleration and then it retards to come to an instantaneous rest.

Magnet starts to oscillate about centre of the ring

Magnet continuous to move along the axis with constant velocity

The magnet retards and comes to rest finally.

answer is D.

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Detailed Solution

Due to the motion of the magnet , emf and current will be induced in the ring, curren will be anticlockwise. As a result the magnet will be repelled by the ring .As the velocity of the magnet decreases, induced current in the ring also decreases.So the magnet will finally stop .

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