Physics 9702 · AS & A Level · Stress and strain

Stress and strain — practice question

A copper wire having a length of $3.6\,\text{m}$ and a diameter of $1.22\,\text{mm}$ is pulled by a force of $37\,\text{N}$. Hooke’s law applies to the wire. The Young modulus of copper is $1.17 \times 10^{11}\,\text{Pa}$. What extension is produced by this force?

  • A$0.24\,\text{mm}$
  • B$0.76\,\text{mm}$
  • C$0.97\,\text{mm}$
  • D$3.1\,\text{mm}$

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