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A-LevelPhysicsElectricityOct/Nov 2018Paper 2 Q64 Marks

The diameter of a wire ST varies linearly with distance along the wire as shown in Fig. 6.1. [Figure 6.1] There is a current I in the wire. At end S of the wire, the diameter is d and the average drift speed of the free electrons is vₛ. At end T of the wire, the diameter is 2d.

Q: What topic does this question test?

This question tests Electricity in A-Level Physics (syllabus code 9702). It is worth 4 marks.

📋 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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About This A-Level Physics Question

Topic

This structured question tests Electricity in A-Level Physics (syllabus code 9702). It is worth 4 marks.

Source

This question appeared in the Cambridge A-Level Physics Oct/Nov 2018 examination, Paper 2 Variant 3.

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