A-LevelPhysicsDeformation of solids9702/12 · Feb/Mar 2024 · Q221 Mark
A force-extension graph is produced for a metal wire. What must describe the limit of proportionality of the wire?
Athe point at which the wire breaks
Bthe point beyond which Hooke's law is not obeyed
Cthe point beyond which the wire cannot return to its original length
Dthe point beyond which the wire starts to deform plastically
✓ Correct answer
B: the point beyond which Hooke's law is not obeyed
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