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A bar magnet is released from rest alon...

A bar magnet is released from rest along the axis of a very long, vertical copper tube. After some time the magnet.

A

will come to rest in the tube,

B

will move with constant acceleration g.

C

will start oscillating along vertical line.

D

will acquire almost constant speed.

Text Solution

Verified by Experts

The correct Answer is:
D
Magnet first starts falling down under gravity. Induced current in the tube opposes the motion of magnet by applying magnetic force. If tube has sufficient length then after some time magnetic force becomes equal to weight of the magnet and then onwards magnet starts falling down with constant speed.
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Knowledge Check

  • When a magnet is released from rest along the axis of a hollow conducting cylinder situated vertically as shown in the figure

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  • Magnetic field B along the axis of a long solenoid is given by

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