Leave a tip for good service: https://paypal.me/jjthetutor
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.