Physics (AS & A Level) · May / June 2022 · Paper 13 · Question 20

A steel wire has a length of 300 cm and a cross-sectional area of 0.50 mm². The Young modulus of steel is 2.0 × 10¹¹ Pa. One end of the wire is attached to a fixed point. A load of 10 N is hung from the other end. The wire obeys Hooke's law. What is the extension of the wire?

1. A3.0 × 10⁻⁷ m
2. B3.0 × 10⁻⁵ m
3. C3.0 × 10⁻⁴ m
4. D3.0 × 10⁻² m

As printed in the paper