Inhomogeneous Electromagnetic Wave Equation
Localized time-varying charge and current densities can act as sources of electromagnetic waves in a vacuum. Maxwell's equations can be written in the form of a inhomogeneous electromagnetic wave equation (or often "nonhomogeneous electromagnetic wave equation") with sources. The addition of sources to the wave equations makes the partial differential equations inhomogeneous.
Read more about Inhomogeneous Electromagnetic Wave Equation: SI Units, CGS and Lorentz–Heaviside Units, Covariant Form of The Inhomogeneous Wave Equation, Curved Spacetime, Solutions To The Inhomogeneous Electromagnetic Wave Equation
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