Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

The wire is made of metal and initially measures $2.50\,\text{m}$ in length, with a cross-sectional area of $4.50 \times 10^{-6}\,\text{m}^2$. Its resistivity is $3.50 \times 10^{-7}\,\Omega\,\text{m}$. The wire is then pulled so that its length becomes $2.65\,\text{m}$. It stays cylindrical, and the volume of the wire does not change. Calculate the change in the resistance of the wire.

  • A$0.012\,\Omega$
  • B$0.024\,\Omega$
  • C$0.19\,\Omega$
  • D$0.22\,\Omega$

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