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Physics (AS & A Level) · May / June 2026 · Paper 13 · Question 35

9702Potential dividers

The diagram shows a thermistor and a variable resistor connected to a battery. The temperature of the thermistor decreases. What happens to the reading on the voltmeter, and which change to the resistance of the variable resistor is needed to cause the voltmeter reading to return to its initial value?

  1. Avoltmeter reading decreases; change needed to resistance of variable resistor decrease
  2. Bvoltmeter reading decreases; change needed to resistance of variable resistor increase
  3. Cvoltmeter reading increases; change needed to resistance of variable resistor decrease
  4. Dvoltmeter reading increases; change needed to resistance of variable resistor increase

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Correct answer: D. voltmeter reading increases; change needed to resistance of variable resistor increase

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