May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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35Potential Dividers SensorsHard1 mark
The diagram shows a thermistor and a variable resistor connected to a battery.
a circuit diagram: a battery (several cells in series) connected to a thermistor (a box with a plain diagonal line) in series with a variable resistor (a box with a diagonal arrow); a voltmeter V is connected across the thermistor, between the top of the circuit and the junction between the thermistor and the variable resistor
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?
voltmeter readingchange needed to resistance of variable resistor
Adecreasesdecrease
Bdecreasesincrease
Cincreasesdecrease
Dincreasesincrease