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Find the emf induced in a coil of 60 turns with a flux rate of 3 units.(a) -60(b) -180(c) 60(d) 180I had been asked this question in a national level competition.This interesting question is from Maxwell Law in Time Static Fields in chapter Maxwell Equations of Electromagnetic Theory

Answer»

Right choice is (b) -180

For explanation: The EMF induced is the product of the turns and the flux rate. Thus Vemf = -Ndφ/dt. On substituting N = 60 and dφ/dt = 3, we GET emf as -60 X 3 = -180 UNITS.



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