Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 19

In an experiment to measure the Young modulus of a metal, a wire of the metal of diameter 0.25 mm is clamped, as shown. The wire passes from a clamp, around a frictionless pulley, and then to a second frictionless pulley where loads F are applied to it. A marker is attached to the wire so that the total length of wire between the clamp and the marker is initially 3.70 m. A scale is fixed near to this marker. The graph shows how the reading on the scale varies with F. What is the Young modulus of the metal?

1. A5.5 × 10^10 Pa
2. B9.4 × 10^10 Pa
3. C1.6 × 10^11 Pa
4. D2.2 × 10^11 Pa

As printed in the paper