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The coefficient of coupling between two coils is 0 to 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance…

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The coefficient of coupling between two coils is 0 to 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

A3.54 mH
B7.88 mH
C39.9 mH
D189.3 mH

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Discussion 1

CCommunity25 May 2019

Given that, L1 = 75 mH

L2 = 105 mH

The coefficient of coupling between two coils is 0 to 0.45.

K = 0.45

Mutual inductance $(M = K\sqrt {{L_1}{L_2}} = 0.45 \times \sqrt {75 \times 105} = 39.9\;mH)$