A-LevelPhysicsDeformation of solidsFeb/Mar 2024Paper 1 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
The correct answer is B: the point beyond which Hooke's law is not obeyed
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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