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Q.

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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a

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

b

Magnet starts to oscillate about centre of the ring

c

Magnet continuous to move along the axis with constant velocity

d

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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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,