A cylindrical copper rod having a diameter of 0.40 in has a
resistance of 0.00264 ā¦. Taking the resistivity of copper as 1.745
µā¦-cm at 20ā° C, determine a)the length of rod in ft. b)
resistance of rod when it is drawn down to one third of initial
diameter, the volume remaining unchanged, Assumed that the
resistivity of the copper is not affected by the drawing process.