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19.A solenoid has 2000 turns wound over a length of 0.3 m. The area of its cross section is 1.2 × 10^–3 m^2. Around its central section a coil of 300 turns is wound. If an initial current of 2 A is reversed in 0.25 s, the e.m.f. induced in the coil is equal to |
| Answer» 19.A solenoid has 2000 turns wound over a length of 0.3 m. The area of its cross section is 1.2 × 10^–3 m^2. Around its central section a coil of 300 turns is wound. If an initial current of 2 A is reversed in 0.25 s, the e.m.f. induced in the coil is equal to | |