Physics (AS & A Level) · Oct / Nov 2022 · Paper 12 · Question 31

A nichrome wire has a resistance of 15 Ω and a diameter of 3.0 mm. 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?

1. A9.8 × 10⁻⁷ m s⁻¹
2. B3.9 × 10⁻⁶ m s⁻¹
3. C6.1 × 10⁻⁶ m s⁻¹
4. D2.5 × 10⁻⁵ m s⁻¹

As printed in the paper