MHT CET 2025 Physics question

A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is

(A)more than acceleration due to gravity.
(B)less than acceleration due to gravity.Correct
(C)depends on the diameter of ring and length of magnet.
(D)depends on pole strength of magnet.

Answer: (B)

Solution

As the magnet falls, the flux through the copper ring changes and an emf and current are induced in the ring. By Lenz's law the induced current opposes the change causing it, i.e. the ring's magnetic field exerts an upward force on the falling magnet both while it approaches the ring and while it leaves it. This

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Question ID VK-102200