A-LevelPhysicsD.C. circuitsOct/Nov 2018Paper 2 Q76 Marks
A potentiometer is connected to a battery of electromotive force (e.m.f.) 9.6V and negligible internal resistance, as shown in Fig. 7.1. [Figure 7.1] The maximum resistance of the potentiometer is 800 Ω. A resistor R of resistance 400 Ω is connected between the slider and end X of the potentiometer.
📋 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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