A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2014 · Q361 Mark

In the potentiometer circuit shown, the reading on the ammeter is zero. [Figure 36.1] The light-dependent resistor (LDR) is then covered up and the ammeter gives a non-zero reading. Which change could return the ammeter reading to zero?

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ADecrease the supply voltage.

BIncrease the supply voltage.

CMove the sliding contact to the left.

DMove the sliding contact to the right.

✓ Correct answer

C: Move 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, Oct/Nov 2014 Paper 1 Variant 2, question 36.

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