Two spherical shells have a common center. The inner shell has radius${\mathit{R}}_{\mathbf{1}}$= 5.00 cm and charge${\mathit{q}}_{\mathbf{1}}\mathbf{=}\mathbf{+}\mathbf{3}\mathbf{.}\mathbf{0}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{6}}\mathit{C}$; the outer shell has radius ${\mathit{R}}_{\mathbf{2}}$= 15.0 cm and chargelocalid="1664267292506" ${\mathit{q}}_{\mathbf{2}}\mathbf{=}\mathbf{-}\mathbf{5}\mathbf{.}\mathbf{0}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{6}}\mathit{C}$. Both charges are spread uniformly over the shell surface. What is the electric potential due to the two shells at the following distances from their common center: (a) r = 2.50 cm; (b) r = 10.0 cm; (c) r = 20.0 cm? Take V = 0 at a large distance from the shells.

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