Question

In a transformer, the coefficient of mutual inductance between the primary and the secondary coil is $0.2H$. When the current changes by $5A/s$ in the primary, the induced e.m.f. in the secondary will be

• A. 5 V
• B. 1 V
• C. 6 V
• D. 2 V

Answer 1

Answer: (B)

$|e|=M\frac{di}{dt}=0.2\times 5=1V$