A-LevelPhysicsElectricity9702/12 · Oct/Nov 2017 · Q331 Mark

Two copper wires are joined together and carry a current, as shown. [Figure showing two copper wires P (diameter d) and Q (diameter 2d) joined in series carrying a current] Wire P has diameter d and wire Q has diameter 2d. What is the ratio average drift speed of the free electrons in wire P / average drift speed of the free electrons in wire Q?

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A1/4

B1/2

✓ Correct answer

D: 4

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2017 Paper 1 Variant 2, question 33.

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