Question

If the current $3.0A$ flowing in the primary coil is made zero in $0.1sec$, the emf induced in the secondary coil is $1.5V$. The mutual inductance between the coils is

• A. $0.05H$
• B. $0.5H$
• C. $0.1H$
• D. $0.2H$

Answer 1

The correct option is A $0.05H$

Given,
$i=3.0At=0.1sec{e}_{induced}=1.5V$

induced emf $e_{\text{induced}}=-M\frac{di}{dt}$
$1.5=-M\times \frac{0-3}{0.1}M=\frac{1.5\times 0.1}{3}M=0.05H$