A-LevelPhysicsElectricity9702/12 · Oct/Nov 2019 · Q311 Mark
When the current in a wire is 5.0 A, the average drift speed of the conduction electrons in the wire is 7.4 × 10⁻⁴ m s⁻¹. Which row gives a possible cross-sectional area and number of conduction electrons per unit volume for this wire?
A7.2 × 10⁻⁷ m², 1.2 × 10²⁸ m⁻³
B7.2 × 10⁻⁷ m², 5.9 × 10²⁸ m⁻³
C2.3 × 10⁻⁶ m², 7.3 × 10²⁶ m⁻³
D2.3 × 10⁻⁶ m², 3.7 × 10²⁷ m⁻³
✓ Correct answer
B: 7.2 × 10⁻⁷ m², 5.9 × 10²⁸ m⁻³
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