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dielectric sphere (with permittivity [tex]\varepsilon_1 [/tex]) which is

placed in field of point charge q lying outside the sphere where

permittivity is [tex]\varepsilon_2 [/tex]. I've tried to solve it

using Legendre polynomilas but I obtain infinite sum which

I cannot interpretate as images (maybe I made a mistake).

So this problem cannot be solve using methods of images???