Question

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 Ω across its ends. What is the resistivity of the material from which this rod is made?

Answer 1

Answer:

2.25 x 10^-6   ohm - m     2.25 x 10^-4 ohm - cm

Explanation:

rho = R A/l

  R = .040

   A = .015 * .015  m^2

     l = 4         rho =