Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A wire has a resistance of $9.55\,\Omega$ and a diameter of $0.280\,\text{mm}$. The wire is made from a metal with resistivity $4.90 \times 10^{-7}\,\Omega\,\text{m}$. What length is the wire?

  • A$1.20\,\text{m}$
  • B$4.80\,\text{m}$
  • C$19.0\,\text{m}$
  • D$76.0\,\text{m}$

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