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**1. Homework Statement**

Hi everyone. I am having trouble figuring out how to solve this problem. The right answer is E

## Homework Equations

Well, we do have the law of conservation of charge.

I also know that Work by a conservative force = - change in potential energy

## The Attempt at a Solution

So I am having trouble figuring out a general approach.

First things first, when I have two of these spheres touch, they are going to become equipotential spheres. I thus have a charge of 0.5*Q on each of them. Then I said that one of these spheres is fixed and we are moving the other one out and out while the electric field from the first is doing work on it.

This could change its electric potential energy.

How is my approach so far?

Thanks in advance for the help and being willing to help.