A-LevelPhysicsElectricity9702/12 · May/June 2011 · Q331 Mark

A cylindrical piece of a soft, electrically-conducting material has resistance R. It is rolled out so that its length is doubled but its volume stays constant. What is its new resistance?

AR / 2

C2R

D4R

✓ Correct answer

D: 4R

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2011 Paper 1 Variant 2, question 33.

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