A-LevelPhysicsElectricity9702/12 · May/June 2014 · Q311 Mark

A copper wire is to be replaced by an aluminium alloy wire of the same length and resistance. Copper has half the resistivity of the alloy. What is the ratio diameter of alloy wire / diameter of copper wire?

A√2

C2√2

✓ Correct answer

A: √2

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2014 Paper 1 Variant 2, question 31.

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