A-LevelPhysicsD.C. circuits9702/12 · May/June 2023 · Q371 Mark

In the potentiometer circuit shown, the reading on the ammeter is zero. [Figure 37.1] The light-dependent resistor (LDR) is then covered and the ammeter gives a non-zero reading. Which change could return the ammeter reading to zero?

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Adecreasing the supply voltage

Bincreasing the supply voltage

Cmoving the sliding contact to the left

Dmoving the sliding contact to the right

✓ Correct answer

C: moving the sliding contact to the left

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2023 Paper 1 Variant 2, question 37.

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