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Which, among the following, is the correct formula to find the coupling coefficient?

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Which, among the following, is the correct formula to find the coupling coefficient?

(a) k=M/sqrt(L1L2)

(b) k=M/sqrt(L1^2)

(c) k=M/sqrt(L2^2)

(d) k=M/(L1L2)

The question was posed to me by my school teacher while I was bunking the class.

The above asked question is from Coupling Coefficient in portion Inductance in a DC Circuit of Basic Electrical Engineering

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Right answer is (a) k=M/sqrt(L1L2)

To elaborate: The correct formula for the coupling coefficient is k=M/sqrt(L1L2). Where L1 and L2 are the inductance values of the first and second coil respectively and M is the mutual inductance.

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