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Discovery of electromagnetic rotation Conception of magnetic lines of force Early
housing for livestock Extensive and ... He set up a simple experiment in which a
wire carrying an electric current rotated in the field of a horseshoe magnet.
Ample evidence exists that some atoms or ions, depending on their electronic
structure, have a permanent magnetic moment, u. This moment may be pictured
as a dipole consisting of a positive, or north pole, of strength m separated from a
The permanent magnetic moment of atoms or ions has two possible sources: the
motion of the electrons about their atomic nucleus (orbital angular momentum)
and the rotation of the electron about its own axis (spin angular momentum).
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review