In the realm of magnetism, Advanced Magnet Source delves into the diverse range of magnets that exist worldwide. Magnets exhibit a captivating phenomenon called magnetism, where they generate a force extending into a magnetic field, attracting iron or steel objects.
According to Home Science Tools’ Learning Center, there are three main types of magnets: temporary magnets, permanent magnets, and electromagnets. Temporary magnets, such as screwdrivers, can be magnetized temporarily in the presence of a magnetic field but gradually lose their magnetism when the field is removed. Examples include certain irons, iron alloys, paper clips, and nails.
On the other hand, permanent magnets retain their magnetism for an extended period. They can be naturally-occurring “rare-earth” elements or chemical compounds. Alnico, an alloy of aluminum, nickel, and cobalt, and ferrites, ceramic-like materials made from iron oxides mixed with nickel, strontium, or cobalt, are examples of permanent magnets.
Electromagnets, the third type, are created by running an electrical current through a coil with a metal core. The energized coil generates a magnetic field, which disappears when the current is shut off. Electromagnets are commonly used in applications requiring strength, including railroad tracks, motor engines, MRI machines, cranes, and computer and television hardware.
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