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Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 22

9702Stress and strain

A force–extension graph is produced for a metal wire. What must describe the limit of proportionality of the wire?

  1. Athe point at which the wire breaks
  2. Bthe point beyond which Hooke's law is not obeyed
  3. Cthe point beyond which the wire cannot return to its original length
  4. Dthe point beyond which the wire starts to deform plastically

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Correct answer: B. the point beyond which Hooke's law is not obeyed

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