Four point charges have the same magnitude of 2.4 1012 C
Chapter 18, Problem 19.57(choose chapter or problem)
Four point charges have the same magnitude of 2.4 1012 C and are fixed to the corners of a square that is 4.0 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.
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