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13) The electrostatic potential V=kr sin 0 [V] exists in a medium of relative permittivitys, . where k is some constant. The volume charge density p, in (C/m'] in the medium is given by: kss, cos² e A) r sin 8 k && B) r sin e 3k & r sine 3ks, cos²0 r sine kes, sin C) D) E)