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

Which, among the following, is the correct formula to find the coupling coefficient? Correct Answer k=M/sqrt(L1L2)

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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