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Physics (AS & A Level) · May / June 2020 · Paper 12 · Question 20

9702Elastic and plastic behaviour

Which statement describes what is meant by the plastic deformation of a material?

  1. AIt always obeys Hooke's law.
  2. BIt does not return to its original length when the extending force is removed.
  3. CIt never obeys Hooke's law.
  4. DIt returns to its original length when the extending force is removed.

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Correct answer: B. It does not return to its original length when the extending force is removed.

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