electric quadrupole moment
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electric quadrupole moment[i¦lek·trik ′kwä·drə‚pōl ‚mō·mənt]
A quantity characterizing an electric charge distribution, obtained by integrating the product of the charge density, the second power of the distance from the origin, and a spherical harmonic Y *2 m over the charge distribution.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.