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AP Physics C: E&M
11.8 Resistor Capacitor (RC) Circuits
IntermediateMCQMathematical24.3k
A circuit diagram showing an ideal battery with voltage epsilon. The battery is connected in series to a switch S and a resistor R1 (labeled R). After the resistor R1, the wire reaches a junction that splits into two parallel branches. The left parallel branch contains a resistor R2 (also labeled R). The right parallel branch contains a capacitor C. The two branches then rejoin and return to the negative terminal of the battery.
A circuit containing a battery, two resistors, and a capacitor.
An ideal battery of voltage \(\varepsilon\) is connected in series with a switch \(S\) and a resistor of resistance \(R\). This series combination is connected to a parallel network consisting of a second resistor of resistance \(R\) and an initially uncharged capacitor of capacitance \(C\). At time \(t = 0\), the switch \(S\) is closed. Which of the following correctly pairs the current \(I_0\) supplied by the battery immediately after the switch is closed and the charge \(Q_{\infty}\) on the capacitor after the switch has been closed for a long time?

Choice\(I_0\)\(Q_{\infty}\)
(A)\(\dfrac{\varepsilon}{R}\)\(\dfrac{C\varepsilon}{2}\)
(B)\(\dfrac{\varepsilon}{2R}\)\(\dfrac{C\varepsilon}{2}\)
(C)\(\dfrac{\varepsilon}{R}\)\(C\varepsilon\)
(D)\(\dfrac{\varepsilon}{2R}\)\(C\varepsilon\)

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