Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A copper wire has a length of $6.4\,\text{m}$ and a resistance of $0.92\,\Omega$. The resistivity of copper is $1.8 \times 10^{-8}\,\Omega\,\text{m}$. What is the wire’s diameter?

  • A$5.7 \times 10^{-5}\,\text{m}$
  • B$1.0 \times 10^{-4}\,\text{m}$
  • C$4.0 \times 10^{-4}\,\text{m}$
  • D$7.1 \times 10^{-4}\,\text{m}$

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