I am not sure... should I just take into account the forces applied by each of the corners on the center, q.
I can draw a free body diagram for that, but without concrete number I am lost on how to write the expression.
Simple electric force problem with point masses... includes picture!
Homework Statement
Four point charges of +/- q are arranged on the corners of a square of side L as illustrated in the figure. What is the net electric force that these charges exert on a point charge q placed at the center...