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Two coils are placed near each other. The mutual inductance of this pair of coils depends on:

1. the rates at which the currents in the two coils are changing
2. the relative position and orientation of the two coils
3. the materials of the wires forming the coils
4. the magnitudes of the currents in the two coils

Correct answer: the relative position and orientation of the two coils

Solution

Mutual inductance M is fixed by the geometry: the size and shape of the coils, number of turns, the core/medium, and their relative position and orientation. It does not depend on the currents or how fast they change.

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