A-LevelPhysicsElectric fieldsMay/June 2010Paper 1 Q281 Mark
The diagram shows two points P and Q which lie, 90° apart, on a circle of radius r. A positive point charge at the centre of the circle creates an electric field of magnitude E at both P and Q. [Figure 28.1] Which expression gives the work done in moving a unit positive charge from P to Q?
A0
BE × r
CE × (πr / 2)
DE × (πr)
✓ Correct Answer
The correct answer is A: 0
📋 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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