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$ \textrm{Maxwell's equations} \\\nabla \cdot \mathbf{D}=\rho _f \, \small (\textrm{Gauss' law}) \\ \nabla \cdot \mathbf{B}=0 \, \small (\textrm{Gauss' law})\\ \nabla \times \mathbf{E}=-\frac{\partial \mathbf{B}}{\partial t} \, \small (\textrm{Maxwell-Faraday equation})\\ \nabla \times \mathbf{H}=\mathbf{J}_f+\frac{\partial \mathbf{D}}{\partial t} \, \small (\textrm{Ampere's circuital law})$