A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2025 · Q311 Mark

A copper wire is 6.4 m long and has a resistance of 0.92 Ω. The resistivity of copper is 1.8 × 10⁻⁸ Ωm. What is the diameter of the wire?

A5.7 × 10⁻⁵ m

B1.0 × 10⁻⁴ m

C4.0 × 10⁻⁴ m

D7.1 × 10⁻⁴ m

✓ Correct answer

C: 4.0 × 10⁻⁴ m

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2025 Paper 1 Variant 2, question 31.

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