A-LevelPhysicsD.C. circuitsMay/June 2020Paper 1 Q381 Mark
In the circuit shown, X is a variable resistor whose resistance can be changed from 5.0 Ω to 500 Ω. The electromotive force (e.m.f.) of the battery is 12.0 V. It has negligible internal resistance. [Figure 38.1] What is the maximum range of values of potential difference across the output?
A1.3 V to 11.1 V
B1.3 V to 12.0 V
C1.5 V to 11.1 V
D1.5 V to 12.0 V
✓ Correct Answer
The correct answer is A: 1.3 V to 11.1 V
📋 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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