In the RC circuit shown in below, the battery has fully charged the capacitor, so Q0 = C%. Then at t = 0 the switch is thrown from position a to b. The battery emf is 20.0 V, and the capacitance C =...

Extracted text: In the RC circuit shown in below, the battery has fully charged the capacitor, so Q0 = C%. Then at t = 0 the switch is thrown from position a to b. The battery emf is 20.0 V, and the capacitance C = 1.02 microF. The current I is observed to decrease to 0.50 of its initial value in 40 micro seconds. (a) What is the value of Q, the charge on the capacitor, at t = 0? (b) What is the value of R? (c) What is Q at t = 60 ^ts? R 20.0 V C= F1.02 uF