A capacitor consists of two concentric spherical shells of radii Ri and R0. The space between them is filled with a dielectric of relative permittivity εr from Ri to b(Ri < b < R0) and another dielectric of relative permittivity 2εr from b to R0.
a) Determine E and D everywhere in terms of an applied voltage V.
b) Determine the capacitance.
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