Field and Wave Electromagnetics 2nd Edition by David Cheng

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A simple classical model of an atom consists of a nucleus of a positive charge Ne surrounded by a spherical electron cloud of the same total negative charge. (N is the atomicnumber and e is the magnitude of electronic charge.) An external electric field E 0. will causethe nucleus to be displaced a distance r 0 from the center of the electron cloud, thus polarizingthe atom. Assuming a uniform charge distribution within the electron cloud of radius b, find r 0.