Of the approximately thirty elementary particles known or assumed to exist today about half are charged. The rest are electrically neutral, though some of these undoubtedly consist of positive and negative charge distributions, as does for example the neutron. A complete understanding of these particles will involve quantum mechanics, quantum field theory, or perhaps a not‐yet‐dreamed‐of theory. But under certain conditions a classical description is adequate.
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© 1962 American Institute of Physics.
1962
American Institute of Physics
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