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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
11.3 Resistance, Resistivity, and Ohm’s Law
IntermediateMCQConceptual25.6k
A rectangular schematic circuit diagram. On the left vertical segment is a DC voltage source labeled \(\Delta V\), with a longer horizontal line on top and a shorter parallel line below. From the positive terminal, the wire extends to the right along the top rail through a zigzag resistor labeled R_0 to a top junction dot. The circuit splits into two parallel vertical branches: the left branch contains a zigzag resistor labeled R_1 = R; the right branch contains an open-knife switch symbol labeled S in series with a zigzag resistor labeled R_2 = 2R. Both vertical branches reconnect at a bottom junction dot, which connects along the bottom rail back to the negative terminal of the battery. No other labels, lines, text, or axes appear.
Circuit schematic with a series resistor and two parallel branches.
A circuit contains an ideal battery of potential difference \(\Delta V\), a series resistor of resistance \(R_0\), and two parallel branches with resistances \(R_1 = R\) and \(R_2 = 2R\). A switch \(S\) is connected in series with resistor \(R_2\) and is initially closed. If switch \(S\) is opened, which of the following correctly describes the change in the electric current \(I_1\) through resistor \(R_1\) and provides the correct justification?

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