A-LevelPhysicsElectric fieldsMay/June 2016Paper 1 Q311 Mark
Two parallel metal plates, 4.0cm apart, are at electric potentials of 800V and 2000 V. Points X, Y and Z are situated in the space between the plates at distances of 1.0cm, 2.0 cm and 3.0 cm from the lower plate. [Figure 31.1] What is the electric field strength, in Vm⁻¹, at X, Y and Z?
AX: 300, Y: 600, Z: 900
BX: 1100, Y: 1400, Z: 1700
CX: 3.0 × 10⁴, Y: 3.0 × 10⁴, Z: 3.0 × 10⁴
DX: 5.0 × 10⁴, Y: 5.0 × 10⁴, Z: 5.0 × 10⁴
✓ Correct Answer
The correct answer is C: X: 3.0 × 10⁴, Y: 3.0 × 10⁴, Z: 3.0 × 10⁴
📋 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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