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Consider the self-inductances of two coils as 12 H and 5 H. 50 % of one flux links the other.The mutual inductance is ___________(a) 30 H(b) 24 H(c) 9 H(d) 4.5 HI got this question during an interview.The question is from Advanced Problems on Network Theorems in section Useful Theorems in Circuit Analysis of Network Theory

Answer»

Correct ANSWER is (d) 4.5 H

The best I can explain: We know that, M = K\(\sqrt{L_1 L_2}\)

Given that, L1 = 12 H, L2 = 5 H and k = 0.5

So, M = 0.5\(\sqrt{12 X 5}\)

= 0.5\(\sqrt{60}\)

= 0.5 X 7.75 = 3.875 H.



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