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Which, among the following, is the correct expression for mutual inductance?

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Which, among the following, is the correct expression for mutual inductance?

(a) M=N2φ2/I2

(b) M=N2φ2/I1

(c) M=N1φ2/I2

(d) M=N1φ1/I1

I had been asked this question in exam.

Question is from Mutual Inductance topic in portion Inductance in a DC Circuit of Basic Electrical Engineering

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Right choice is (b) M=N2φ2/I1

For explanation I would say: Mutual inductance is the product of the number of turns in one coil and the flux linkages of that coil, divided by the current in the other coil. Hence M=N2φ2/I1 is the correct expression.

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