Question
In a transformer, the coefficient of mutual inductance between the primary and the secondary coil is $0.2 \,henry$. When the current changes by $5$ $ampere/second$ in the primary, the induced $e.m.f$. in the secondary will be......$V$
✓
Answer
(b) $e = M\frac{{di}}{{dt}} = 0.2 \times 5 = 1\;V$
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