Jöfnur Maxwells

Jöfnur Maxwells eru mikilvægustu jöfnur innan rafsegulfræðinnar, fyrst settar fram af James Clerk Maxwell 1861.

Name	Deildisframsetning	Heildisframsetning
lögmál Gauss:	$\nabla \cdot \mathbf{E} = \frac {\rho} {\epsilon_0}$	$\oint_S \mathbf{E} \cdot \mathrm{d}\mathbf{A} = \frac {Q_S}{\epsilon_0}$
lögmál Gauss fyrir segulmagn (engin seguleinskaut):	$\nabla \cdot \mathbf{B} = 0$	$\oint_S \mathbf{B} \cdot \mathrm{d}\mathbf{A} = 0$
lögmál Faradays:	$\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}} {\partial t}$	$\oint_{\partial S} \mathbf{E} \cdot \mathrm{d}\mathbf{l} = - \frac {d \Phi_{B,S}}{dt}$
lögmál Ampers (með viðbót Maxwells):	$\nabla \times \mathbf{B} = \mu_0 \mathbf{J} + \mu_0 \epsilon_0 \frac{\partial \mathbf{E}} {\partial t}$	$\oint_{\partial S} \mathbf{B} \cdot \mathrm{d}\mathbf{l} = \mu_0 I_S + \mu_0 \epsilon_0 \frac {d \Phi_{E,S}}{dt}$