Any material capable of attracting iron and producing a magnetic field outside itself. By the end of the 19th century, all known elements and many compounds had been tested for magnetism, and all were found to have some magnetic property. However, only three elementsiron, nickel, and cobaltexhibit ferromagnetism. See also compass, electromagnet.
Magnets and their associated magnetic field lines. A permanent magnet (such as a bar or disk
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