# Expressing the interaction energy between two spheres?

1. Oct 17, 2013

### Spiral1183

1. The problem statement, all variables and given/known data
Two identical spheres with radius R have uniform charge Q throughout their volume and separated d>2R apart

2. Relevant equations
https://www.physicsforums.com/attachment.php?attachmentid=63061&d=1382054852 is the general potential energy equation

this should be my total charge inside a sphere?

This is the equation for the interaction energy

3. The attempt at a solution
I found the total charge of the sphere (2nd Eqn.) and I believe that to find the interaction energy, I should treat that as $\Phi$1 and then use the charge from sphere 2?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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