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The coefficient of mutual inductance between two coils depends on

1. medium between the coils
2. separation between the two coils
3. orientation of the two coils
4. all of the above

Correct answer: all of the above

Solution

Mutual inductance depends on how much flux produced by one coil links the other. That linkage changes with the medium, the distance between coils, and their relative orientation, so all listed factors matter.

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