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A solenoid has 2,000 turns wound over a ...

A solenoid has 2,000 turns wound over a length of 0.3 m. The area of its cross-section is `2 xx 10^-3 m^2`. A round its central part, a coil of 300 turns is wound. If an initial current of 2 A is reversed in 0.25 s, the induced e.m.f. produced in the coil is:

A

`6 xx10^-4 V`

B

`4.8 xx 10^-2`

C

`6 xx10^-2 V`

D

48 V

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