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For perfect (ideal) coupling between two coils of self-inductances L1 and L2, the mutual inductance M is given by:

1. M = L1 * L2
2. M = L1 / L2
3. M = sqrt(L1 * L2)
4. M = (L1 / L2)^(1/2)

Correct answer: M = sqrt(L1 * L2)

Solution

The coupling coefficient is k = M/sqrt(L1*L2). For perfect coupling k = 1, giving M = sqrt(L1*L2).

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