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The formula provides a natural generalization of the Coulomb's law for cases where the source charge is moving: = [′ ′ + ′ (′ ′) + ′] = ′ Here, and are the electric and magnetic fields respectively, is the electric charge, is the vacuum permittivity (electric field constant) and is the speed of light.
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The electric field of such a uniformly moving point charge is hence given by: [25] = () /, where is the charge of the point source, is the position vector from the point source to the point in space, is the ratio of observed speed of the charge particle to the speed of light and is the angle between and the observed velocity of the charged ...
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where is the electric constant and = | | is the distance between each pair of electrons located at points on the sphere defined by vectors and , respectively. Simplified units of e = 1 {\displaystyle e=1} and k e = 1 / 4 π ϵ 0 = 1 {\displaystyle k_{e}=1/4\pi \epsilon _{0}=1} (the Coulomb constant ) are used without loss of generality.
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