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Physics (AS & A Level) · Oct / Nov 2024 · Paper 11 · Question 21

9702Elastic and plastic behaviour

A wire is stretched by a gradually increasing force. The force–extension graph for the wire is shown. Which statement must be correct?

  1. APoint Q is the elastic limit.
  2. BPoint R is the limit of proportionality.
  3. CThe area under the graph from P to S is the elastic potential energy stored in the wire.
  4. DThe area under the graph from P to S is the work done in stretching the wire.

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Correct answer: D. The area under the graph from P to S is the work done in stretching the wire.

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