Physics (AS & A Level) · May / June 2025 · Paper 13 · Question 34

A steel wire with a length of 2.20 m is connected to a battery as shown. The reading on the voltmeter is 1.50 V and the reading on the ammeter is 4.90 A. The resistivity of steel is 6.90 × 10⁻⁷ Ω m. What is the diameter of the steel wire?

1. A1.76 × 10⁻⁴ m
2. B3.52 × 10⁻⁴ m
3. C1.26 × 10⁻³ m
4. D2.51 × 10⁻³ m

As printed in the paper