A bar magnet is released from rest along the axis of a very long, vertical copper tube.After some time the magnet
Updated On: Jul 5, 2022
will stop in the tube
will move with almost contant speed
will move with an acceleration g
will oscillate
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The Correct Option isB
Solution and Explanation
By Lenz's Law , as long as the magnet has a non zero acceleration, the flux linking with the aluminium tube will keep changing, and hence to opposes it a current and accompanying magnetic field will be induced that opposes that change in flux.
This induced field will repel the the magnet in the direction opposite to its motion. Eventually the magnetic repulsion due to induced field by Lenz's Law will be equal to the gravitational pull on the magnet and it will reach a constant velocity.
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
When we place the conductor in a changing magnetic field.
When the conductor constantly moves in a stationary field.