A-LevelPhysicsElectricity9702/12 · Oct/Nov 2024 · Q341 Mark

An electric current of 12 A is in a wire of length 0.35 m. The average drift speed of the free electrons (charge carriers) in the wire is 5.0 × 10⁻⁴ ms⁻¹. How many free electrons are in the wire?

A1.3 x 10¹⁶

B5.3 x 10²²

C1.5 x 10²³

D4.3 x 10²³

✓ Correct answer

B: 5.3 x 10²²

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2024 Paper 1 Variant 2, question 34.

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