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Mutual inductance between two coaxial coils, when current changes in the primary, is best defined as:
AFlux in secondary per unit current in primary
BEMF in primary per unit current in primary
CFlux in primary per unit current in primary
DResistance of secondary per unit current
Answer & Solution
Correct answer: A. Flux in secondary per unit current in primary
$M = \phi_{\text{secondary}}/I_{\text{primary}}$. By symmetry, this equals $\phi_{\text{primary}}/I_{\text{secondary}}$, so $M_{12} = M_{21}$.
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