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woprxcpe1704tks
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Homework Statement
Consider two equal point charges q, separated by a distance 2a. Construct the plane equidistant from the two charges. By integrating Maxwell’s stress tensor over this plane, determine the force of one charge on the other.
I have the full solution, but I'm confused on one part. Where does the E=1/4pi...cos(θ)r come from? And by that I mean where does each component come from? I know about the 1/4piε0, but I don't understand the rest.
Full Solution