A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2025 · Q361 Mark

A potentiometer circuit is used to determine the electromotive force (e.m.f.) E_X of a cell. The circuit includes a second cell of known e.m.f. E₀ and negligible internal resistance, and a uniform resistance wire PQ of known length. E_X is less than E₀. The movable connection J can be positioned anywhere along the length of the resistance wire. Which circuit is suitable for determining E_X?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A[Diagram option A]

B[Diagram option B]

C[Diagram option C]

D[Diagram option D]

✓ Correct answer

D: [Diagram option D]

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2025 Paper 1 Variant 2, question 36.

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