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Calculate the emf of a coil with turns 100 and flux rate 5 units.(a) 20(b) -20(c) 500(d) -500I had been asked this question in an interview.I want to ask this question from Inductances in portion Magnetic Forces and Materials of Electromagnetic Theory

Answer»

Correct option is (d) -500

To elaborate: The emf is the product of the turns of the coil and the FLUX RATE. Thus e = -N dφ/dt, where the negative SIGN indicates that the emf induced is OPPOSING the flux. Thus e = -100 X 5 = -500 units.



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