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 distance from its centre such that the nearer pole is north pole as shown in figure. A sharp impilse is applied on the magnet so that it starts to move towards the ring. Then,

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

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Magnet starts to oscillate about centre of the ring

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Magnet continues to move along the axis with constant velocity

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The magnet retards and comes to rest finally.

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Solution

The correct option is D The magnet retards and comes to rest finally.
As the magnet goes near the ring, the flux through the ring increases.
According to Lenz law, induced current runs in the ring such that the induced flux acts opposite to the increasing flux and thus opposes the motion of the magnet.
With times, the induced current would be large enough to stop the movement of magnet.

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