JEE Advanced 2008 Physics question

STATEMENT-1 : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. and STATEMENT-2 : Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

(A)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
(B)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
(C)STATEMENT-1 is True, STATEMENT-2 is FalseCorrect
(D)STATEMENT-1 is False, STATEMENT-2 is True

Answer: (C)

Solution

Statement-1: a soft-iron core concentrates the magnetic field (making it stronger and radial), increasing the torque per unit current and hence the sensitivity : true.

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Question ID VK-037639