Physics (AS & A Level) · Oct / Nov 2020 · Paper 11 · Question 19

A wire of circular cross-section, which obeys Hooke’s law, is used to suspend a basket as shown. The Young modulus for the material of the wire is 2.5 × 10^11 Pa. When a weight of 34 N is added to the basket, the strain in the wire increases by 6.0 × 10^–5. What is the radius of the wire?

1. A7.2 × 10^–7 m
2. B2.3 × 10^–6 m
3. C8.5 × 10^–4 m
4. D1.7 × 10^–3 m

As printed in the paper