Physics

Problem

Two concentric spherical shells have radii

R = 10\,\text{cm}

and

2R = 20\,\text{cm}

. The inner shell carries a charge of

+2\,\mu\text{C}

, and the outer shell carries a charge of

-4\,\mu\text{C}

. Determine the electric potential at the common center of the shells. Take

k = 9 \times 10^{9}\,\text{N}\cdot\text{m}^{2}/\text{C}^{2}