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Magnetic flux
Common symbols	$Φ$ , $Φ B$
SI unit	weber (Wb)
Other units	maxwell
In SI base units	kg⋅m²⋅s⁻²⋅A⁻¹
Dimension	M L² T⁻² I⁻¹

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In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface. It is usually denoted $Φ$ or $Φ B$ . The SI unit of magnetic flux is the weber (Wb; in derived units, volt–seconds), and the CGS unit is the maxwell. Magnetic flux is usually measured with a fluxmeter, which contains measuring coils, and it calculates the magnetic flux from the change of voltage on the coils.