Two 400-mH coils L_1 and L_2 have a coefficient of coupling k equal to 0.2. Calculate L_M.
Question 18.9: Two 400-mH coils L1 and L2 have a coefficient of coupling k ...
L_M=K\sqrt{L_1\times L_2}
=0.2\sqrt{400\times 10^{-3}\times 400\times 10^{-3}}
=0.2\times 400\times 10^{-3}
=80\times 10^{-3}H or mH
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