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