A-LevelPhysicsElectricity9702/12 · Feb/Mar 2019 · Q351 Mark

A wire of cross-sectional area 5.0 × 10⁻⁶ m² is made of a metal of resistivity 50 × 10⁻⁸ Ω m. The potential difference across the wire is 6.0 V and the current is 3.0 A. What is the length of the wire?

A0.050 m

B0.20 m

C5.0 m

D20 m

✓ Correct answer

D: 20 m

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2019 Paper 1 Variant 2, question 35.

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