ooaog5 charge density on end of wire vs. r/L charge density at wire resistor interface vs. r/L 0 0.1 0.2 0.3 0.4 05 Z/L(or r/L, radial distance >15 charge density on end of wire vs. r/L 0LA··…···· charge density at wit resistor interface vs. r/L 0.0 0.2 03 4 0.5 Z/L (or r/L, radial distance Fig 9. The same as Fig. 8, except that the resistivity ratio between resistor and wire is r=500(top)or 5(bottom ). The lines and points at the left, extending in r/L to a/L=0.05, are for the interface and end Am J Phys., Vol 64, No. 7, July 1996 J. D. Jackson