A coil having 500 square loops each of side 10 cm is placed normal to a magnetic field which increases at the rate of 1 T s^−1. The induced e.m.f. is? (A) 0.1V (B) 5.0V (C) 0.5V (D) 1.0V

Answer: (B) 5.0V

Given,

number of coil turns = 500

Side of square loop, l = 10cm = 0.1m

Rate of change of magnetic field = 1Ts-1

EMF = d(NBA)/dt

EMF = NA dB/dt

Emf = 500 × 0.1 × 0.1 × 1 = 5.0 V

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