A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2025 · Q351 Mark

The diagram shows a circuit with a battery of electromotive force (e.m.f.) 60 V and negligible internal resistance, a 20 kΩ resistor, a thermistor and a voltmeter. The resistance of the thermistor is 20 kΩ. [Figure 35.0] The temperature of the thermistor decreases, and this causes its resistance to change by 50%. After this change, what is the reading on the voltmeter?

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A20 V

B24 V

C36 V

D40 V

✓ Correct answer

B: 24 V

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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 35.

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