MHT CET 2023 Physics question

A hollow metal pipe is held vertically and 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)

(A)equal to g
(B)less than gCorrect
(C)more than g
(D)zero

Answer: (B)

Solution

As the magnet falls, the magnetic flux through each section of the metal pipe changes, so by Faraday's law eddy currents are induced in the pipe. By Lenz's law these currents produce a magnetic field that opposes the motion of the magnet, which exerts an upward retarding force on it. The net downward force is $mg

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Question ID VK-095131