Show that the capacitance between two metal spheres of radius a_1 and a_2, separated by a center-to-center distance of D is given by C = 4 pi epsilon_0 epsilon_r a_1 a_2/a_1 + a_2 if the spheres are far apart (i.e. D >> a_1 and D >> a_2). The two Spheres are in a linear dielectric material with relative permittivity, epsilon_r.

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