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:
“We are in great haste to construct a magnetic telegraph from Maine to Texas; but Maine and Texas, it may be, have nothing important to communicate.”
—Henry David Thoreau (1817–1862)
“Frankly, I’d like to see the government get out of war altogether and leave the whole field to private industry.”
—Joseph Heller (b. 1923)
“There is no permanent class of hired laborers amongst us. Twenty five years ago, I was a hired laborer. The hired laborer of yesterday, labors on his own account today; and will hire others to labor for him tomorrow. Advancement—improvement in condition—is the order of things in a society of equals.”
—Abraham Lincoln (1809–1865)