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AP Physics 2
11.6 Kirchhoff’s Loop Rule
11.5 Compound Direct Current (DC) Circuits
11.4 Electric Power
IntermediateMCQMathematicalConceptual21.5k
A schematic circuit diagram drawn with clean black lines on a white background. On the left vertical branch, there is an ideal battery represented by long and short parallel lines labeled V_0, with the longer line at the top representing the positive terminal. From the top of the battery, a wire extends horizontally to the right, connecting to Lightbulb 1 (drawn as a circle with an X inside, labeled 1). After Lightbulb 1, the wire reaches a junction point that splits into two parallel vertical branches. The first vertical branch contains Lightbulb 2 (drawn as a circle with an X inside, labeled 2). The second vertical branch, to the right of the first, contains Lightbulb 3 (drawn as a circle with an X inside, labeled 3) in series with an open switch labeled S. The bottom of both parallel vertical branches rejoin at a single wire that returns horizontally to the negative terminal at the bottom of the battery. No other components, text, or labels appear.
Circuit schematic containing three identical lightbulbs and a switch.
A circuit contains an ideal battery of potential difference \(V_0\), three identical lightbulbs labeled 1, 2, and 3, and a switch \(S\), as shown. Lightbulb 1 is in series with the battery, while Lightbulbs 2 and 3 are in parallel with each other through switch \(S\). Which of the following statements correctly describes the change in brightness of Lightbulbs 1 and 2 when switch \(S\) is closed, and provides the correct physical reasoning?

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