O-LevelPhysicsElectricity5054/12 · May/June 2020 · Q371 Mark

A metal wire of length l and cross-sectional area A has resistance R. A second wire is made from the same metal. It has a length 2l and a cross-sectional area 4A. What is the resistance of the second wire?

A8R

B2R

CR / 2

DR / 8

✓ Correct answer

C: R / 2

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2020 Paper 1 Variant 2, question 37.

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