Physics (AS & A Level) · Feb / March 2021 · Paper 12 · Question 35

An electrical cable consists of seven strands of copper wire, each of diameter 0.30 mm, connected in parallel. The resistivity of copper is 1.72 × 10⁻⁸ Ω m. The current in the cable is 13 A. What is the potential difference (p.d.) between two points on the cable a distance of 1.0 m apart?

1. A0.0045 V
2. B0.11 V
3. C0.45 V
4. D3.2 V

As printed in the paper