Magnetic Flux

Magnetic flux describes the lines of a magnetic field emanating from a magnetised object or objects.

Magnetic fields are represented by continuous magnetic flux lines that leave the North side of a magnet and re-enter via the south side as in the first animation below.

The amount, or magnetic flux density, the occurs is dependant on the strength of the magnetic field. The unit of magnetic flux is the Wb (Weber) named after the German physicist Wilhelm Eduard Weber and the unit of magnetic flux density is Wb/m2.

Questions on magnetic flux appear in the 2330-202, 2330-203, 2330-301 and the 2357-309 exams.

Magnetic lines of flux for a single magnet

Magnetic lines of flux for two magnets sited next to each other

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