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in Physics by (60.8k points)

A capacitor of capacitance 100μF is connected to a battery of 20volts for a long time and then disconnected from it. It is now connected across a long solenoid having 4000turns per metre. It is found that the potential difference across the capacitor drops to 90% of its maximum value in 2.0 seconds. Estimate the average magnetic field produced at the centre of the solenoid during this period.

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C = 100μf, Q = CV = 2 × 10–3C, t = 2sec,

V = 20V, V' = 18V, Q' = CV = 1.8 × 10–3C,

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