Electrostatics – finding the work done

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

2. Relevant equations

3. The attempt at a solution
I don’t think the given problem requires me to find an expression of potential energy as a function of the equal side lengths. Also, I am not sure how would I set up the integral even if I want to find the expression for potential energy. There is probably some trick to this question but I am honestly clueless about it.

Any help is appreciated. Thanks!

Attached Images
File Type: png folding the triangle.png (5.2 KB)
File Type: png 935-final-small.png (23.7 KB)

http://ift.tt/1bKRRsA

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