The current in a coil of inductance 0.2 H changes from 5 A to 2 A in 0.5 sec. The magnitude of the average induced emf in the coil is (A) 0.3 V (C) 1.2 V (B) 0.6 V (D) 30 V
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A: The inductance is expressed using the formula as, Vrms =Io22πfLL=2 Vrms2Ioπf
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