A-LevelPhysicsD.C. circuitsOct/Nov 2014Paper 1 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?
ADecrease the supply voltage.
BIncrease the supply voltage.
CMove the sliding contact to the left.
DMove the sliding contact to the right.
✓ Correct Answer
The correct answer is C: Move the sliding contact to the left.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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