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Four identical charges Q+ occupy the corners of a square with sides of lengtha. A fifth charge,q, can be placed at any desired location. Find the location of the fifth charge, and the value ofq, such that the net electric force acting on the original four charges, Q+, is zero.

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So, I don't know if I'm thinking this out right, but should the 5th charge be in the middle like that? And if so, should it be positive? Or would that just all fly apart, and it should be negative?

I know I should probably take the components and make them all equal to each other, but I wanted to make sure I started this question off right.

Thanks :)

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# Homework Help: Point charges in a square

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