Part-DB

Welcome to Part-DB.

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And God said
$\nabla \cdot \vec{D} = \rho$, $\nabla \cdot \vec{B} = 0$, $\nabla \times \vec{E} = -\frac{\partial \vec{B}}{\partial t}$, $\nabla \times \vec{H} = \vec{j} + \frac{\partial \vec{D}}{\partial t}$,
and then there was light.