Magnetic Flux

${\Phi }_B=\vec{B}\cdot \vec{A}=BA\cos \theta$

• $\vec{B}$ is the magnetic field passing through a surface
• $\vec{A}$ is a vector of the same magnitude as the surface’s area and normal to the surface
• $\theta$ is the angle between $\vec{B}$ and $\vec{A}$