A-LevelPhysicsElectric fieldsMay/June 2010Paper 1 Q261 Mark
Two oppositely-charged parallel plates are arranged as shown. [Figure 26.1] An electron is released from rest from the surface of the negatively-charged plate. The electron travels from the negatively-charged plate towards the positively-charged plate. Which graph shows how the force F on the electron varies with its distance x from the negative plate? [Figure 26.2]
AGraph A: Force F decreases as distance x increases
BGraph B: Force F increases as distance x increases
CGraph C: Force F increases linearly with distance x
DGraph D: Force F is constant with distance x
✓ Correct Answer
The correct answer is D: Graph D: Force F is constant with distance x
📋 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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