Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be:
maximum in situation
maximum in situation
maximum in situation
the same in all situations
Mutual inductance between two coils depend on their degree of flux linkage i.e., the fraction of flux linked with one coil which is, when some current passes through the other coil. In figure (A) two coils with their planes are parallel. In this situation, maximum flux passes.
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