Physics (AS & A Level) · Oct / Nov 2025 · Paper 12 · Question 22

A copper wire has length 1.7 m and uniform diameter 0.64 mm. The Young modulus of copper is 1.2 × 10¹¹ Pa. What is the spring constant of the wire?

1. A2.3 × 10⁴ N m⁻¹
2. B9.1 × 10⁴ N m⁻¹
3. C4.5 × 10⁷ N m⁻¹
4. D7.1 × 10⁷ N m⁻¹

As printed in the paper