1. The problem statement, all variables and given/known data Three particles with euqal positive charge q are placed at three corners of a square side d. a) what is the force on a postive charge q0 placed at the center of the square? b) what would be the force on q0 if it were placed on a vacant corner? 2. Relevant equations I think you have to use gausses law but am not sure and do not know how to do this if i did. 3. The attempt at a solution N.A i dont have a clue, some guidance would be hugely appretiated.