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(B) As the bar magnet falls through the hollow metal pipe,the magnetic flux linked with the pipe changes continuously.According to Faraday's law of el

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less than $g$.

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(B) As the bar magnet falls through the hollow metal pipe,the magnetic flux linked with the pipe changes continuously.According to Faraday's law of electromagnetic induction,this change in magnetic flux induces an electromotive force $(emf)$ in the pipe.Since the pipe is a conductor,this induced $emf$ causes eddy currents to flow within the body of the pipe.According to Lenz's law,these eddy currents create a magnetic field that opposes the motion of the falling magnet.This opposing force acts upwards,reducing the net downward force on the magnet.Consequently,the net acceleration of the magnet is less than the acceleration due to gravity $(g)$.

$A$ hollow metal pipe is held vertically and a bar magnet is dropped through it with its length along the axis of the pipe. The acceleration of the falling magnet is ($g=$ acceleration due to gravity).

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