Dipole moments of conducting particle chains

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Abstract
The method of images is used to calculate the effective dipole and quadrupole moments of short chains consisting of identical spherical conducting particles. For the case where the particles are not in physical contact, the electrical constraint imposed on the particles in the chain strongly influences the results. The dipole moments for chains of electrically isolated particles are very sensitive to spacing. If chains of particles are levitated dielectrophoretically, this sensitivity of the effective moment to spacing may be exploited in order to characterize conducting particles with insulating surface layers.

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