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Find the value of x if the Mutual inductance is 20H, the inductance of coil 1 is xH and the inductance of coil 2 is 8H. The coupling coefficient is 5.

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Find the value of x if the Mutual inductance is 20H, the inductance of coil 1 is xH and the inductance of coil 2 is 8H. The coupling coefficient is 5.

(a) 2H

(b) 4H

(c) 6H

(d) 8H
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Right answer is (a) 2H

Best explanation: we know that:

k=M/sqrt(L1L2)

Substituting the values from the question, we get L1=2H.
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