A-LevelPhysicsElectric fieldsOct/Nov 2021Paper 1 Q321 Mark
A proton enters the uniform electric field between two parallel vertical metal plates in a vacuum. One plate is at a potential of 0 V and the other plate is at a potential of +10 V, as shown. [Figure 32.1] What is the initial change in the motion of the proton caused by the electric field, immediately after the proton enters the field?
AIt begins to move downwards.
BIt begins to move upwards.
CIts speed decreases.
DIts speed increases.
✓ Correct Answer
The correct answer is C: Its speed decreases.
📋 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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