A-LevelPhysicsElectricityMay/June 2025Paper 1 Q321 Mark

A wire is made from a metal of constant resistivity. There is a constant current in the wire. Which statement about the potential difference across the wire is correct?

Q: What topic does this question test?

This question tests Electricity in A-Level Physics (syllabus code 9702). It is worth 1 mark.

AIt is directly proportional to the length of the wire.

BIt is inversely proportional to the length of the wire.

CIt is directly proportional to the diameter of the wire.

DIt is inversely proportional to the diameter of the wire.

✓ Correct Answer

The correct answer is A: It is directly proportional to the length of the wire.

📋 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 multiple-choice question tests Electricity in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics May/June 2025 examination, Paper 1 Variant 2.

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