Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A metal wire with a length of $1.4\,\text{m}$ has a constant cross-sectional area of $7.8 \times 10^{-7}\,\text{m}^2$. The metal’s resistivity is $1.7 \times 10^{-8}\,\Omega\,\text{m}$. What is the wire’s resistance?

  • A$0.016\,\Omega$
  • B$0.031\,\Omega$
  • C$33\,\Omega$
  • D$64\,\Omega$

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