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An air-cored solenoid with length 30 cm,...

An air-cored solenoid with length 30 cm, area of cross-section 25 cm2 and number of turns 800, carries a current of 2.5 A. The current is suddenly switched off in a brief time of 10-3s. Ignoring the variation in magnetic field near the ends of the solenoid, the average back emf induced across the ends of the open switch in the circuit would be

A

zero

B

3.125 volts

C

6.54 volts

D

16.74 volts

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