Physics 5054 · O Level · Resistance

Resistance — practice question

A wire with length $0.50\,\text{m}$ and cross-sectional area $1.0 \times 10^{-6}\,\text{m}^2$ has a resistance of $0.75\,\Omega$. A second wire made from the same material has length $2.0\,\text{m}$ and cross-sectional area $0.50 \times 10^{-6}\,\text{m}^2$. What is the resistance of this longer wire?

  • A$0.094\,\Omega$
  • B$0.38\,\Omega$
  • C$1.5\,\Omega$
  • D$6.0\,\Omega$

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