A Arc magnet
Though most people are familiar with simple, Arc Magnets, there are many other types of magnets. They are categorized as permanent, temporary, and electromagnetic. Permanent magnets maintain their magnetic properties for an extended period of time while temporary magnets lose their magnetism more quickly. An electromagnet, on the other hand, is one that is created using electricity. Its strength can be altered based on the electrical current that is allowed to move through it.
One demonstration is to pour metal shavings (filings) onto a piece of paper that is suspended above a magnet. If done currently, over time the filings will align themselves into arcs going outward from the bar magnet’s north and south poles. Another demonstration involves attempt to touch the north poles of two different weak bar magnets together. The poles repel each-other.
Disc Magnets are a type of permanent magnets which are known as rare earth magnets, due to the fact that they contain one or more of the rare earth elements of the periodic table. Most neodymium magnets are made of a metal alloy containing neodymium, iron, and boron. They are much stronger than most of the magnets we are accustomed to using, like refrigerator magnets. Because of the forces they generate, these magnets can be dangerous or even cause fatal injury if not handled properly.
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