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AP Physics 2
11.7 Kirchhoff’s Junction Rule
11.6 Kirchhoff’s Loop Rule
11.5 Compound Direct Current (DC) Circuits
IntermediateMCQProportional AnalysisConceptual14.1k
The diagram shows a rectangular DC circuit schematic. On the left vertical wire, there is an ideal battery labeled with emf \(\varepsilon\), with the longer line representing the positive terminal at the top. From the top wire, current flows to the right through a resistor labeled \(R_1\). After \(R_1\), the wire reaches a junction point where it splits into two parallel vertical paths. The left-most parallel path contains a single resistor labeled \(R_2\). The right-most parallel path contains a resistor labeled \(R_3\) and a switch \(S\) that is initially shown in the open position. Both vertical paths rejoin at a lower junction point. A single horizontal wire connects this lower junction back to the bottom negative terminal of the battery. No other labels, lines, text, or axes appear.
A circuit containing three resistors and a switch.
A circuit consists of an ideal battery with emf \(\varepsilon\) connected to a resistor \(R_1\) in series with a parallel combination of a resistor \(R_2\) and a branch containing a resistor \(R_3\) and a switch \(S\). Initially, the switch is open. The switch is then closed. Which of the following correctly describes the changes in the total current \(I_{total}\) provided by the battery and the potential difference \(V_1\) across resistor \(R_1\)?

Total Current \(I_{total}\)Potential Difference \(V_1\)
(A)DecreasesDecreases
(B)IncreasesDecreases
(C)IncreasesIncreases
(D)DecreasesIncreases

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