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Polarizability of a tri-isotropic sphere.

This report presents the polarizability matrix of a tri-isotropic sphere. A tri-isotropic material exhibits coupling between electric, magnetic, and in addition, a third kind of material response. Each of these three fields creates three different kind of polarizations. The paper derives the polarizability components of such a sphere in vacuum and makes physical interpretations of the results for the copolarizabilities and cross polarizabilities.