Magnetic Flux or Magnetic Induction, denoted by B, is a measure of the strength of a magnetic field over a given area, and is expressed in Weber.
The references in this article are unclear because of a lack of inline citations. (July 2016) (Learn how and when to remove this template message)
In physics, specifically electromagnetism, the magnetic flux (often denoted Φ or ΦB) through a surface is the surface integral of the normal component of the magnetic field flux density B passing through that surface. 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 electronics, that evaluates the change of voltage in the measuring coils to calculate the measurement of magnetic flux.