Question
Define mutual inductance in terms of flux and current.
The mutual inductance $M _{21}$ is defined as the flux linkage of coil 2 when $1 A$ current flows through coil 1.
$
M _{21}=\frac{ N _2 \phi_{21}}{i_1}
$
Question 5.
Define mutual inductance in terms of emf and current.
Answer:
Mutual inductance $M_{21}$ is also defined as the opposing emf induced is the coil 2 when the rate of change of current through the coil 1 is 1 $As ^{-1}$.
$
M _{12}=\frac{-\varepsilon_1}{d i_2 / d t}
$
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