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Question

(B) When a bar magnet falls vertically through the hollow region of a long vertical copper tube,the changing magnetic flux linked with the tube induce

Vedclass · Accepted Answer

The magnet moves with continuously increasing velocity and ultimately acquires a terminal velocity.

Vedclass · Answer

(B) When a bar magnet falls vertically through the hollow region of a long vertical copper tube,the changing magnetic flux linked with the tube induces eddy currents in the body of the tube.According to Lenz's law,these eddy currents oppose the motion of the falling magnet,creating a retarding force.As the velocity of the magnet increases,the rate of change of magnetic flux increases,which in turn increases the magnitude of the eddy currents and the resulting retarding force.Eventually,the retarding force becomes equal to the weight of the magnet.At this point,the net force on the magnet becomes zero,and it attains a constant final terminal velocity,falling with zero acceleration.

$A$ magnet is dropped down an infinitely long vertical copper tube. Then

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