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## Homework Statement

Given two concentric spherical metal shells, with radii a and b (a < b), and surface charge densities Sa and Sb.

Find the capacitance if Sa = - Sb.

## Homework Equations

C = Q/V

## The Attempt at a Solution

I would know how to solve this if the absolute values of the charges were equal, but here the densities are equal and not the charges. I don't know how the capaticance is defined in this case. How do I solve this?