Assuming that a group of n conductors carrying linear charge densities q1, q2, …, qn are located above the ground plane, the voltage of conductor i to ground is
qi is the charge of conductor i in coulombs/meter.
di is the radius of conductor i.
Dii is the distance between conductor i and its image (i.e. 2hi in Figure 1).
dij is the distance between conductor i and conductor j.
Dij is the distance between conductor i and the image of conductor j as illustrated in Figure 1.
is the permittivity of the medium.
Note: The distances associated with each logarithmic ratio (e.g. di and Dii or din and Din) of Equation 31 must be expressed in the same units.