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1. The problem statement, all variables and given/known data

Hey guys.

Look at this question, I'm suppose to find how much energy does it take to build this sphere with the new formula.

The answer suppose to be (3/5) * (kQ^2/R), instead I got (1/10) * (kQ^2/R).

I tried to solve it again and again but nothing, I couldn't find the problem.

Any idea where I got this wrong?

Thanks.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Electric potential 3

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