1.

Calculate the mutual inductance of two tightly coupled coils with inductances 49H and 9H.(a) 21(b) 58(c) 40(d) 49/9I had been asked this question in an interview.My doubt is from Inductances topic in chapter Magnetic Forces and Materials of Electromagnetic Theory

Answer»

Correct option is (a) 21

Easy explanation: For tightly coupled coils, the coefficient of coupling is UNITY. Then the MUTUAL INDUCTANCE will be M = √(L1 x L2)= √(49 x 9) = 21 units.



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