Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

Gold is occasionally chosen for use in tiny connecting wires inside electronic circuits. One gold wire has a length of $2.50 \times 10^{-3}\,\text{m}$ and a cross-sectional area of $6.25 \times 10^{-8}\,\text{m}^2$. The resistivity of gold is $2.30 \times 10^{-8}\,\Omega\,\text{m}$. Calculate the resistance of the wire.

  • A$3.6 \times 10^{-18}\,\Omega$
  • B$5.8 \times 10^{-13}\,\Omega$
  • C$9.2 \times 10^{-4}\,\Omega$
  • D$6.8 \times 10^{-3}\,\Omega$

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