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Question

(A) As the bar magnet falls through the copper tube,the changing magnetic flux through the tube induces eddy currents in the copper walls according to

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Move down with almost constant speed

Vedclass · Answer

(A) As the bar magnet falls through the copper tube,the changing magnetic flux through the tube induces eddy currents in the copper walls according to Faraday's law of induction.According to Lenz's law,these eddy currents create a magnetic field that opposes the motion of the magnet.This opposing force acts upwards,counteracting the gravitational force $(mg)$ acting downwards.As the speed of the magnet increases,the induced eddy currents and the resulting opposing magnetic force also increase.Eventually,the upward magnetic force becomes equal to the downward gravitational force,resulting in a net force of zero.At this point,the magnet reaches a terminal velocity and moves down with an almost constant speed.

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

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