A wire 1.0m long and with cross-sectional area 2.0 x 10-7 m2 has a resistance…

Physics WAEC 2008

A wire 1.0m long and with cross-sectional area 2.0 x 10-7 m2 has a resistance of 0.1\(\Omega\). Calculate the electrical conductivity of the wire

  • 2.0 x 107\(\Omega^{-1} m^{-1}\)
  • 5.0 x 107\(\Omega^{-1} m^{-1}\) checkmark
  • 2.0 x 108\(\Omega^{-1} m^{-1}\)
  • 5.0 x 108\(\Omega^{-1} m^{-1}\)

The correct answer is: B

Explanation

K = \(\frac{1}{RA} = \frac{1}{0.1 \times 2 \times 10^{-7}} = 5 \times 10^7\)
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