Magnet speed dating
Magnetism is a class of physical phenomena that are mediated by magnetic fields.
Electric currents and the magnetic moments of elementary particles give rise to a magnetic field, which acts on other currents and magnetic moments.
A blacksmith holds a piece of red-hot iron in a north-south direction and hammers it as it cools.
The magnetic field of the Earth aligns the domains, leaving the iron a weak magnet.
A material may exhibit more than one form of magnetism as these variables change.
As with magnetizing a magnet, demagnetizing a magnet is also possible.
An illustration from Gilbert's 1600 De Magnete showing one of the earliest methods of making a magnet.
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