Answer: Three identical point charges q are placed at each
Chapter 21, Problem 21.71(choose chapter or problem)
Three identical point charges q are placed at each of three corners of a square of side L. Find the magnitude and direction of the net force on a point charge -3q placed (a) at the center of the square and (b) at the vacant corner of the square. In each case, draw a free-body diagram showing the forces exerted on the -3q charge by each of the other three charges.
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