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

A cube of side s has a point charge at each corner. Explain how you would find the electric field vector at a point a distance A from the center of any face along a normal to the face through the center of the face. If all the charges were identical, discuss how you would take advantage of the symmetry of the problem to solve it.

2. Relevant equations

E=F/q=kq/r^(2)

3. The attempt at a solution

What's throwing me off is the wording of this problem. It doesn't tell me the kind of charge these eight point charges have.(Does it even matter in this case?)Am I supposed to draw out multiple vectors representing how they act upon the test charge, or am I just looking for one vector? I'm really lost.

So, I drew a 3D cube with black dots at each corner. Then, I drew a test charge above the top face of the cube, lined up with the face's center too.

After that, I'm really confused as to how to move on. Any sort of help that would get me in the right direction would be greatly appreciated.

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# Homework Help: Finding an electric field vector

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