Fields

Flux

$${\Phi }_{\vec{B}}={\int }_S\vec{B}\cdot {\vec{u}}_{N}dS$$

Where $\vec{B}$ is the field and ${\vec{u}}_N$ is the normalized normal vector of the surface $S$.

If the surface is flat and the field is uniform, we simplify to:

$${\Phi }_{\vec{B}}=\vec{B}\cdot \vec{S}$$