Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 36

A potentiometer circuit may be used to determine the unknown electromotive force (e.m.f.) E of a cell. The circuit diagrams shown include a battery of known e.m.f. and negligible internal resistance, a uniform resistance wire XY and a galvanometer. Which circuit diagram shows a suitable arrangement for determining E?

1. ACircuit diagram A
2. BCircuit diagram B
3. CCircuit diagram C
4. DCircuit diagram D

As printed in the paper