- #1

bmarvs04

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## Homework Statement

A conducting sphere 4.5 cm in radius carries 40 nC. It's surrounded by a concentric spherical conducting shell of radius 20 cm carrying -40 nC.

Find the potential at the sphere's surface, taking the zero of potential at infinity.

## Homework Equations

Inside Sphere: V = Q / (4*pi*ε0*R)

Outside Sphere: V = Q / (4*pi*ε0*r)

## The Attempt at a Solution

So I figured I would add these two potentials up, giving this:

V = 9*10^9 [ ( 4*10^-5 ) / .045 + ( -4*10^-5) /.2 ] = 6200000V