A-LevelPhysicsElectric fieldsMay/June 2020Paper 2 Q712 Marks
A potential difference is applied between two horizontal metal plates that are a distance of 6.0 mm apart in a vacuum, as shown in Fig. 7.1. [Figure 7.1] The top plate has a potential of –450V and the bottom plate is earthed. Assume that there is a uniform electric field produced between the plates. A radioactive source emits a β⁻ particle that travels through a hole in the bottom plate and along a vertical path until it reaches the top plate.
📋 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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