Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A power cable is $2000\,\text{m}$ long. It consists of twelve parallel strands of copper wire, each strand having a diameter of $0.51\,\text{mm}$. Calculate the resistance of the cable. (resistivity of copper = $1.7 \times 10^{-8}\,\Omega\,\text{m}$)

  • A$0.014\,\Omega$
  • B$3.5\,\Omega$
  • C$14\,\Omega$
  • D$166\,\Omega$

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