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## Homework Statement

Consider four concentric spherical metal

shells of radii r, 2r, 3r, and 4r. The middle

two shells are connected by wire, as shown.

What is the total capacitance of the system?

In your solution, clearly explain your method.

## Homework Equations

u= 1/2cv^2

## The Attempt at a Solution

So my teacher told us to assume we can hook it up to a battery(voltage) and that the two inner shells have the same charge and to evaluate the potential inner to outer, but I have no idea how to do this.