In a RC circuit, the battery has fully charged the capacitor. Then at t=0 the battery is removed. The battery emf is 20.0 V, and the capacitance C= 1.02 µF. The current I is observed to decrease to 0.50 of its initial value in 40 µs . (a) What is the value of Q, the charge on the capacitor, at t = 0 sec? (b) What is the value of R? (c) What is Q at 60 µs?

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