Question

A primary coil and secondary coil are placed close to each other. A current, which changes at the rate of 25 A in a millisecond, is present in the primary coil. If the mutual inductance is $92 \times 10^{-6} H$, then the value of induced emf in the secondary coil is

• A. 4.6 V
• B. 2.3 V
• C. 0.368 mV
• D. 0.23 mV

Answer 1

Answer: (B)

2.3 V

Answer 2

The induced emf in secondary coil.
$e=M \frac{d i}{d t}=92 \times 10^{-6} \times \frac{25}{1 \times 10^{-3}}=2.3 \,V$