Physics (AS & A Level) · Oct / Nov 2024 · Paper 11 · Question 37

A potentiometer circuit is used to determine the electromotive force (e.m.f.) E of a cell. The circuit includes a second cell of e.m.f. 1.5 V and internal resistance 0.50 Ω that is connected to a uniform resistance wire XY, as shown. The resistance wire XY has a length of 0.96 m and a resistance of 0.50 Ω. The movable connection Z is moved along wire XY. The galvanometer reading is zero when length XZ is 0.64 m. What is the value of e.m.f. E?

1. A0.50 V
2. B0.75 V
3. C1.0 V
4. D1.1 V

As printed in the paper