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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
AdvancedMCQMathematicalConceptual13.7k
Circuit schematic with switches S1 and S2.
Circuit schematic with switches S1 and S2.
An electric circuit consists of two ideal batteries, each with potential difference \(\varepsilon\), three identical resistors of resistance \(R\), and two switches, \(S_1\) and \(S_2\), connected as shown in the diagram. Switch \(S_1\) is initially closed while switch \(S_2\) is open, resulting in branch currents \(I_1\) through the left battery and \(I_2\) through the middle resistor. Switch \(S_2\) is then closed.

ChoiceCurrent \(I_1\)Current \(I_2\)
AIncreasesDecreases
BIncreasesIncreases
CDecreasesDecreases
DDecreasesIncreases

Which choice correctly describes the changes in the magnitudes of currents \(I_1\) and \(I_2\) after switch \(S_2\) is closed?

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