A-LevelPhysicsElectricity9702/12 · Oct/Nov 2023 · Q321 Mark

The potential difference across a metal wire is kept constant. The length l and the diameter d of the wire are both varied. The type of metal is kept the same. How is the current in the wire related to l and d?

AIt is directly proportional to l and inversely proportional to d.

BIt is directly proportional to l and inversely proportional to d².

CIt is inversely proportional to l and directly proportional to d.

DIt is inversely proportional to l and directly proportional to d².

✓ Correct answer

D: It is inversely proportional to l and directly proportional to d².

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2023 Paper 1 Variant 2, question 32.

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