A-LevelPhysicsElectricity9702/12 · Oct/Nov 2022 · Q311 Mark
A nichrome wire has a resistance of 15Ω and a diameter of 3.0mm. The number density of the free electrons in nichrome is 9.0 × 10²⁸ m⁻³. A potential difference (p.d.) of 6.0 V is applied between the ends of the wire. What is the average drift speed of the free electrons in the wire?
A9.8 x 10⁻⁷ ms⁻¹
B3.9 x 10⁻⁶ ms⁻¹
C6.1 x 10⁻⁵ ms⁻¹
D2.5 x 10⁻⁵ ms⁻¹
✓ Correct answer
B: 3.9 x 10⁻⁶ ms⁻¹
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