Magnetic Field and Permanent Magnets
Permanent magnets are objects that produce their own persistent magnetic fields. They are made of ferromagnetic materials, such as iron and nickel, that have been magnetized, and they have both a north and a south pole.
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Famous quotes containing the words magnetic, field and/or permanent:
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—Henry David Thoreau (1817–1862)
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—Maria Stewart (1803–1879)
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—James A. Garfield (1831–1881)