The important information contained in this chapter is summarized below.

Magnetism Summary

Magnetic flux - group of magnetic field lines that are emitted outward from the north pole of a magnet

Magnetic flux density - amount of magnetic flux per unit area of a section, perpendicular to the direction of the flux

Weber - measure of magnetic flux

Permeability - ability of a material to concentrate magnetic lines of flux

Ferromagnetic materials - iron, steel, nickel, cobalt, and commercial alloys with relative permeability ranging from 50-200

Paramagnetic materials - aluminum, platinum, manganese, and chromium with relative permeability of slightly more than one

Diamagnetic materials - bismuth, antimony, copper, zinc, mercury, gold, and silver with relative permeability of less than one

Magnetomotive force (mmf) - strength of a magnetic field in a coil of wire dependent on current flowing through coil

Ampere turns - current flowing through a coil times the number of turns in the coil

Field intensity - identifies the magnetic flux density per unit length of a coil

Reluctance - opposition to the production of flux in a material