Magnetic materials attract substances made from iron, and they also also attract other magnets. Places on the magnet that produce magnetic forces are called poles, and they are either north or south. Round magnets and bar magnets, two common types, differ not only because of their shape, but also because of the location of these poles.
Features
Magnets may be temporary, permanent or electromagnetic. Electromagnets are formed from wires that carry moving charges or currents. Round or bar magnets may belong to any of these categories, but they're widely used as permanent magnets.
Significance
Round magnets are used to create speakers, ear phones and motors; they're also used to lift heavy objects, such as cars. Bar magnets are used for latching, holding and automation; they're most often used to demonstrate magnetic fields.
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