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Calculate the mutual inductance of two tightly coupled coils with inductances 49H and 9H.

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Calculate the mutual inductance of two tightly coupled coils with inductances 49H and 9H. (a) 21 (b) 58 (c) 40 (d) 49/9 I had been asked this question in an interview. My doubt is from Inductances topic in chapter Magnetic Forces and Materials of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

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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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