Consider the free-body diagram:
The force due to -3q located at the vacant point is obtained as follows:
Force due to charge at point 1
F1 = kq(3q)/L2 = 3kq2/L2
Three identical charges q are placed at each of three corners of a square of side L. Find the magnitude of the net force on a point charge -3q placed at the vacant corner of the square. Draw a free-body diagram showing the forces exerted on the -3q charge by each of the other three charges.
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