## Answers

Mutual in distance, M = mu_0 mu_r N_1 N_2 pi r^2_1/l_1 = 4 pi times 10^-7 times 60 times 4000 times 400 times pi times (2 times 10^-2)^2/0.4 = 53.589 times 10^-3 H M = 53.59 mH

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