MHT CET Physics question

The coil of a sensitive M.C.G. swings too far on both sides. This movement can be quickly stopped by?

(A)Holding a magnet near the coil
(B)Earthing the case of the galvanometer
(C)Connecting a large resistance across the ends of the coil
(D)Connecting a short length of copper wire across the ends of the coilCorrect

Answer: (D)

Solution

Shorting the coil lets a large induced current flow, and by Lenz's law the resulting electromagnetic damping stops the swing quickly; a large resistance

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Question ID VK-078585