Physics (AS & A Level) · May / June 2023 · Paper 13 · Question 32

A wire has a length of 3.0 m and is made of metal of resistivity 4.9 × 10⁻⁷ Ω m. A potential difference (p.d.) of 12 V is applied across the wire so that it has a current of 1.4 A. What is the cross-sectional area of the wire?

1. A1.2 × 10⁻⁷ m²
2. B1.7 × 10⁻⁷ m²
3. C1.1 × 10⁻⁶ m²
4. D1.3 × 10⁻⁵ m²

As printed in the paper