Magnetic flux

Magnetic flux, usually denoted by Greek letter Φ, is a measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field. The flux through an element of area perpendicular to the direction of magnetic field is given by the product of the magnetic field density[?] and the area element. More generally, magnetic flux is defined by a scalar product of the magnetic field density[?] and the area element vector. The Maxwell's equations in the absence of magnetic monopoles requires that the magnetic flux through a closed surface is zero. The SI unit of magnetic flux is the weber.