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Homework Statement
Find the electric field for a point in the center of a square, +45microC on one corner and -27microC on the other 3
Homework Equations
E = (kQ1)/r2
The Attempt at a Solution
I know how to do the Electric field equations in a straight line, but for a square I'm not sure how to set it up. Also is the electric field always negative? Apparently it is in the direction of the force, but to find the force one must understand that the field repels negative charges and attracts positive, so I'm assuming it is negative.