CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1 · Question Q21

The potential divider above is formed from a thermistor and a 200\ \Omega resistor. The thermistor has a resistance of 2\text{ k}\Omega at room temperature and 200\ \Omega at 100\ ^\circ\text{C}. What is the change in the potential at A when the thermistor is moved from water at room temperature to boiling water?

1. (A)Rise of about 8\text{ V}
2. (B)Fall of about 8\text{ V}
3. (C)Rise of about 18\text{ V}
4. (D)Fall of about 18\text{ V}

This question uses a figure or table from the paper — you'll see it when you practise.