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GUJCET 2022 Physics Solved Paper

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Question : 27

Total: 40

An air-cored solenoid with length 30‌cm, area of cross-section 25cm2 and number of turns 500 , carries a current of 2.5A. The current is suddenly switched off in a brief time of 10−3s. How much is the average back emf induced across the ends of the open switch in the circuit? Ignore the variation in magnetic field near the ends of the solenoid.

6.54V
65.4V
654V
0.654V

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