Discussion
The mutual inductance between two coils placed close to each other is inversely proportional to the _______.
Answer: C
The mutual inductance between two coils placed close together is inversely proportional to the length of the coil. For two coils on the same core:
\[ M = \frac{\mu_0 \mu_r N_1 N_2 A}{l} \]
M increases with the number of turns, the permeability and the cross-sectional area, and falls as the length l of the coil increases. The first, second and fourth options are factors that increase M, so the third option is the answer.
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