Physics (AS & A Level) · May / June 2025 · Paper 11 · Question 22

The graph shows the variation with force of the extension of a wire. [graph of extension against force with points P, Q, R] The force is gradually increased to a maximum at Q and then gradually decreased to zero at R. Which statement is correct?

1. AAlong the line PQ, the wire obeys Hooke’s law.
2. BAlong the line RP, the spring constant is equal to extension/force.
3. CThe wire has elastic deformation at point Q.
4. DThe work done in stretching the wire to P is equal to (force × extension) at point P.

As printed in the paper