Name | Math | Description | Pictures |
Gauss' Law | \$$\vec{\nabla} \cdot \vec{E} = \frac{\rho}{\varepsilon_0}\$$ | An electric charge, \$\rho\$, creates an electric field, \$\vec{E}\$, that points away from the charge and “disperses” to infinity | |
Gauss' Law of Magnetism | \$$\vec{\nabla} \cdot \vec{B} = 0\$$ | A magnetic field, \$\vec{B}\$, can not “disperse” to infinity the way an electric field can. Instead, magnetic field lines loop onto themselves. In other words: “magnetic charges” don't exist the way electric charges do. | |
Faraday's Law of Induction | \$$\vec{\nabla} \times \vec{E} = -\frac{\partial \vec{B}}{\partial t}\$$ | A changing magnetic field, \$\vec{B}\$, creates a “curly” electric field, \$\vec{E}\$ and vice-versa. | |
Ampere's Law | \$$\vec{\nabla} \times \vec{B} = \mu_0 \Big(\vec{J} + \varepsilon_0 \frac{\partial \vec{E}}{\partial t} \Big)\$$ | An electric current, \$\vec{J}\$, and/or a changing electric field, \$\vec{E}\$, creates a “curly” magnetic field, \$\vec{B}\$ | |