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Identify the factor on which mutual inductance does not depend.

(a) Relative separation

(b) The relative orientation of the two coils

(c) Reciprocity

(d) Permeability of the core material

The question was asked in an international level competition.

My question is based upon Electromagnetic Inductance topic in section Electromagnetic Induction of Physics – Class 12

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Right option is (c) Reciprocity

Easy explanation: The mutual inductance of two coils is the property of their combination. It does not matter which one of them functions as the primary or the secondary coil. Hence, mutual inductance does not depend on reciprocity.

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