O-LevelPhysicsElectricity5054/11 · May/June 2018 · Q291 Mark

A copper wire X has resistance R. Another copper wire Y has twice the length and half the cross-sectional area of X. What is the resistance of Y?

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AR/2

C2R

D4R

✓ Correct answer

D: 4R

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2018 Paper 1 Variant 1, question 29.

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