21. An air-cored solenoid is of length 0.3 m. Area of cross section 1.2 103 m2 and has 2500 turns. Around itscentral section, a coil of 350 turns is wound. The solenoid and the coil are electrically insulated from eachother. Calculate the emf induced in the coil, if initial current of 3 A in the solenoid is reversed in 0.25 s.

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