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8.13 Electrostatic Potential The ele ctrostatic potential ("voltage") at a point a dis- tance r from a point charge of value q is given by the equation (8.24) where V is in volts, e, is the permeability of free space (8.85 10-12 farads/m). q is the charge in coulombs, and r is the distance from the point charge in meters. If q is positive, the resulting potential is positive; if q is negative, the resulting