Question: A spherical capacitor has inner radius a and outer radius d. Concentric with the spherical conductors and lying between them is a spherical shell of

A spherical capacitor has inner radius a and outer radius d. Concentric with the spherical conductors and lying between them is a spherical shell of outer radius c and inner radius b. If the regions d < r < c, c < r < b, and b < r < a are filled with materials with per-mittivites ε1, ε2, and ε3, respectively, determine the capacitance of the system.

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