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 × 10^-6 H , then the value of induced emf in the secondary coil is

Correct answer: (B) 2.3 ~V. The induced emf in secondary coil. e=M (d i)/(d t)=92 × 10^-6 × frac251 × 10^-3=2.3 ~V

Q134 / 160 · TS EAMCET 2012 · Physics

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

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

Hence, the correct answer is option: 'B'.