A solenoid has `2000` turns wound over a length of `0.3 m`. Its cross-sectional area
Channel: Doubtnut
Date: 2020-07-26

A solenoid has `2000` turns wound over a length of `0.3 m`. Its cross-sectional area is equal to `1.2 xx 10^(-3) m^(2)`. Around its central cross-section a coil of `300` turns in wound. If an initial current of `2 A` flowing in the solenoid is reversed in `0.25 s`, the emf induced in the coil is