If the two coils in Example 18-9 had a mutual inductance L_M of 40 mH, how much would k be?
Question 18.10: If the two coils in Example 18-9 had a mutual inductance LM ...
Formula (18-4) L_M=K\sqrt{L_1\times L_2} can be inverted to find k.
k=\frac{L_M}{\sqrt{L_1\times L_2}}
=\frac{40\times10^{-3} }{\sqrt{400\times10^{-3}\times400\times10^{-3}}}
=0.1
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