A 5-μF capacitor is charged to 30 V and is then connected in series with a 10-μH inductor and a 50-Ω resistor. The potential difference across the capacitor after a long time has passed will be
A) 0.
B) 7 V.
C) 15 V.
D) 30 V.
E) some value that cannot be determined from the given information.

Question

Quizplus · Accepted Answer

After a long time has passed, the circuit will reach a steady-state or equilibrium condition, with no more change in the current or voltage. In this state, the capacitor will behave like an open circuit, while the inductor and resistor will behave like a closed circuit. Therefore, the potential difference across the capacitor will be zero, and none of the other components will have any effect on it. Thus, option A is the correct answer.

A 5-μF Capacitor Is Charged to 30 V and Is