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Encyclopedia of Electrical Engineering
Encyclopedia of Electrical Engineering

# Magnetic Flux

#### What is Magnetic Flux?

Magnetic flux is a measure of the amount of magnetic field passing through a given surface (such as a conducting coil).
It gives the measurement of the total magnetic field that passes through a given surface area. Here, the area under consideration can be of any size and under any orientation with respect to the direction of the magnetic field.
Fig.no.1: Magnetic flux

#### Magnetic Flux Symbol

Magnetic flux is commonly denoted using greek letter Phi ($\Phi _B$).

#### Magnetic Flux Formula

Magnetic flux formula is given by: $$\Phi _B = B.A=BAcos\theta$$ Where, $\Phi _B$ is the magnetic flux.
B is the magnetic field.
A is the area
$\theta$, the angle at which the field lines pass through the given surface area.

#### Magnetic Flux Unit

The unit of the magnetic flux is the tesla meter squared (T. m2, also called the weber - the SI unit of magnetic flux and symbolized Wb). The older units for the magnetic flux, the Maxwell (equivalent to $10^{-8}$ Wb).