Navjyot Kalra
Last Activity: 10 Years ago
Sol. C = 100 μF, emf = 6 V, R = 20 KΩ, t = 4 S.
Charging : Q = CV(1 – e^–t/RC) [-t/RC = 4/2 * 10^4 *10^-4]
= 6 * 10^–4(1 – e^–2) = 5.187 * 10^–4 C = Q
Discharging : q = Q(e^–t/RC) = 5.184 * 10^–4 * e^–2
= 0.7 * 10^–4 C = 70 μc.