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The equivalent inductance of two coils with series opposing flux having inductances 7H and 2H with a mutual inductance of 1H.(a) 10(b) 7(c) 11(d) 13I had been asked this question in a job interview.I would like to ask this question from Inductances in chapter Magnetic Forces and Materials of Electromagnetic Theory

Answer»

The correct option is (B) 7

The BEST I can explain: The equivalent inductance of TWO coils in series with opposing FLUX is L = L1 + L2 – 2M, where L1 and L2 are the self inductances and M is the mutual inductance. Thus L = 7 + 2 – 2(1) = 7H.



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