Physics — Maxwell's Equations

\nabla\cdot\mathbf{E} = \frac{\rho}{\varepsilon_0}

\nabla\cdot\mathbf{B} = 0

\nabla\times\mathbf{E} = -\frac{\partial \mathbf{B}}{\partial t}

\nabla\times\mathbf{B} = \mu_0\mathbf{J} + \mu_0\varepsilon_0\frac{\partial \mathbf{E}}{\partial t}