Physics (AS & A Level) · Oct / Nov 2022 · Paper 11 · Question 37
A battery of electromotive force (e.m.f.) 6.0 V and negligible internal resistance is connected to a voltmeter and four other components, as shown. The voltmeter is connected between points X and Y. The positive terminal of the voltmeter is connected to X and the negative terminal of the voltmeter is connected to Y. Initially, the resistance of each of the four components is 1.0 kΩ. Which change, on its own, will cause the voltmeter to show a positive reading?
- ADecrease the temperature of the thermistor.
- BIncrease the resistance of the variable resistor.
- CReduce the intensity of light incident on the light-dependent resistor (LDR).
- DReplace the fixed resistor with a 500 Ω resistor.
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Correct answer: C. Reduce the intensity of light incident on the light-dependent resistor (LDR).
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