Physics (AS & A Level) · Oct / Nov 2022 · Paper 12 · Question 20

A known tensile force acts on a metal wire. The wire does not exceed its limit of proportionality. Which two measurements enable the strain of the wire to be calculated?

1. Athe unstretched length of the wire and the cross-sectional area of the wire
2. Bthe unstretched length of the wire and the extension of the wire
3. Cthe Young modulus of the metal and the extension of the wire
4. Dthe Young modulus of the metal and the unstretched length of the wire

As printed in the paper