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The equivalent inductances of two coils 2H and 5H in series aiding flux with mutual inductance of 3H is(a) 10(b) 30(c) 1(d) 13I got this question during an internship interview.My question is taken from Inductances topic in section Magnetic Forces and Materials of Electromagnetic Theory

Answer»

Right option is (d) 13

To EXPLAIN: The EQUIVALENT INDUCTANCE of two coils in series is given by L = L1 + L2 + 2M, where L1 and L2 are the self inductances and M is the mutual inductance. THUS L = 2 + 5 + 2(3) = 13H.



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