# Formula Magnetic Energy Stored in B-Field Magnetic energy    Magnetic field    Volume    Vacuum permeability

## Magnetic energy

Unit
Magnetic energy contained in a region of space where a B-field is present.

## Magnetic field

Unit
Magnetic field in a certain region of space in which magnetic energy is stored.

## Volume

Unit
Volume of a considered region of space for which the magnetic energy is to be calculated.

## Vacuum permeability

Unit
Magnetic field constant is a physical constant and occurs whenever magnetic fields are involved. It has the value $$\mu_0 = 4\pi \cdot 10^{-7} \, \frac{ \mathrm{N} }{ \mathrm{A}^2 }$$.