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50 Chapter Four
FIGURE 4.5 The earth potential as a function of the distance from the
electrode.
earth potential at r = 5r 0 , we will obtain from Eq. (4.5)
V G
= (4.7)
V 5r 0−∞
5
Equation (4.7) shows that 80% of V G falls between the electrode’s
surface and the equipotential surface of radius 5r 0 . This is the reason
FIGURE 4.6 The
earth potential in
its three-
dimensional
development as a
function of the
distance from the
electrode.
