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A capacitor of capacitance 100 micro farad is connected to a battery of 20V for a long time and then disconnected from it. it is now connected across a long solenoid having 4000 turns per metre it is found that the potential diffrence across the capacitor drops to 90% of its maximum value in 2 sec estimate the average magnetic field produced at the centre of the solenoid during this period

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99996112446-0-099996112446-0-1

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