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Physics (AS & A Level) · Feb / March 2021 · Paper 12 · Question 19

9702Stress and strain

Which expression is equal to the stress on a wire?

  1. A\frac{\text{extension}}{\text{original length}}
  2. B\frac{\text{force}}{\text{cross-sectional area}}
  3. C\frac{\text{force}}{\text{extension}}
  4. D\frac{\text{Young modulus}}{\text{original length}}

As printed in the paper

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Correct answer: B. \frac{\text{force}}{\text{cross-sectional area}}

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