${\displaystyle {\begin{array}{l}\nabla \cdot \mathbf {D} =\rho \\\nabla \cdot \mathbf {B} =0\\\nabla \times \mathbf {E} =-{\frac {\partial \mathbf {B} }{\partial t}}\\\nabla \times \mathbf {H} =\mathbf {J} +{\frac {\partial \mathbf {D} }{\partial t}}\end{array}}}$

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