Magnetic Sources

Ferromagnetism

"Ferromagnetism" referrs to magnets made of iron.

Domains are regions with a common magnetic field.

In the presence of an external field, domain boundaries will move so that more domains that are near the direction of the external field will increase in size. This greatly increases the magnetic field of the material.

 

Gauss's Law

Earth's Magnetic Field

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(c) Doug Davis, 2002; all rights reserved