A 20-$\mu$F capacitor is charged to 200 V and is then connected across a 1000-$\Omega$ resistor.The time constant for this circuit is approximately
A)20 ms
B)40 ms
C)10 ms
D)30 ms
E)15 ms

Question

Quizplus · Accepted Answer

The time constant (τ) for an RC circuit is given by τ = R * C. Here, R = 1000 Ω and C = 20 μF = 20 x 10^-6 F. So, τ = 1000 * 20 x 10^-6 = 20 x 10^-3 seconds = 20 ms.

A 20- μ\muμ F Capacitor Is Charged to 200 V and Is Then

A 20- $\mu$ F Capacitor Is Charged to 200 V and Is Then