A wire of length 2 m and diameter 0.5 mm has resistance 5 Ω. Its resistivity is:

  1. 4.91 10^-6 Ω m
  2. 1.96 10^-6 Ω m
  3. 1.23 10^-7 Ω m
  4. 4.91 10^-7 Ω m
Answer

D) 4.91 10^-7 Ω m

A = pi r^2 = 1.96 10^-7 m^2; rho = RAL = 4.91 10^-7 Ω m. SLO P-09-E-13 · Application

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