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In SI units the Maxwell equations in free space are

$\nabla \cdot E=\frac{\rho }{{ϵ}_0},\nabla \cdot B=0,$

(1)

$\nabla \times E=-\frac{\partial B}{\partial t},\nabla \times B={\mu }_{0}J+{\mu }_0{ϵ}_0\frac{\partial E}{\partial t}.$

(2)

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