A-LevelPhysicsElectricity9702/12 · Oct/Nov 2022 · Q341 Mark

A metal wire has resistance R. The wire is stretched so that its diameter decreases to 94.0% of the original diameter. The volume of the wire is unchanged. What is the resistance of the stretched wire?

A1.06R

B1.13R

C1.20R

D1.28R

✓ Correct answer

D: 1.28R

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2022 Paper 1 Variant 2, question 34.

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