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&\nabla \vec E & = & \frac {\rho} {\varepsilon_0}
&\nabla \vec H & = & 0
&\nabla \times \vec E & = & - \mu \frac {\partial \vec H} {\partial t}
&\nabla \times \vec H + \vec J & = &\varepsilon \frac {\partial \vec E} {\partial t} \end{align}|