Physics (AS & A Level) · May / June 2021 · Paper 11 · Question 20

Forces are applied to the ends of a rod so that its length increases. The variation with force F of the extension e of the rod is shown. The point P is the elastic limit. Which shaded area represents the work done during the plastic deformation of the rod?

1. AGraph A: shaded area under the curve from origin to the extension at the final force
2. BGraph B: shaded area above the curve from origin to the final force
3. CGraph C: shaded area above the curve between the extension at P and the final extension
4. DGraph D: shaded area under the curve between the extension at P and the final extension

As printed in the paper