Magnetic Flux -- from Eric Weisstein's World of Physics

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Magnetic Flux

This entry contributed by Kringle Daly

Measuring the magnetic field passing through a cross sectional area S gives the magnetic flux , where

B is the magnetic field vector, and is a differential unit of area pointing perpendicular to the surface S. Knowing allows the electromotive force produced in a current ring with S as its boundary to be computed using Faraday's law as

Therefore, an electromotive force is created only when the flux changes with time, which means only when B or change with time.

The unit of magnetic flux is the Weber.

Faraday's Law, Lenz's Law, Magnetic Field, Magnetic Flux Density, Weber