Physics (AS & A Level) · May / June 2020 · Paper 13 · Question 38

A cell of electromotive force (e.m.f.) 4.0 V and negligible internal resistance is connected to a fixed resistor of resistance 1.0 Ω and a potentiometer of maximum resistance 3.0 Ω, as shown. [circuit diagram: 4.0 V cell, 1.0 Ω fixed resistor, 3.0 Ω potentiometer, terminals X and Y] Which range of potential differences can be obtained between the terminals X and Y?

1. A0 V to 3.0 V
2. B0 V to 4.0 V
3. C1.0 V to 3.0 V
4. D1.0 V to 4.0 V

As printed in the paper