A-LevelPhysicsD.C. circuits9702/12 · May/June 2016 · Q361 Mark

A potential divider circuit is formed by connecting a battery of negligible internal resistance in series with two variable resistors, as shown. [Figure 36.1] The variable resistors have resistances Rx and Ry. Vx is the potential difference across resistance Rx. Rx and Ry are both changed at the same time. Which combination of changes must cause Vx to increase?

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ARx: larger, Ry: larger

BRx: larger, Ry: smaller

CRx: smaller, Ry: larger

DRx: smaller, Ry: smaller

✓ Correct answer

B: Rx: larger, Ry: smaller

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2016 Paper 1 Variant 2, question 36.

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