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The expression for the inductance in terms of turns, flux and current is given by(a) L = N dφ/di(b) L = -N dφ/di(c) L = Niφ(d) L = Nφ/iI got this question in exam.The doubt is from Inductances topic in chapter Magnetic Forces and Materials of Electromagnetic Theory

Answer»

Right CHOICE is (a) L = N dφ/di

The best EXPLANATION: We know that e = -N dφ/dt and also e = -L di/dt. On EQUATING both we GET, L = Ndφ/di is the expression for inductance.



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