A charge Q is placed at the center of the origin on the attached document. What is the force on this charge?
F= kqQ/d2 ^
The Attempt at a Solution
See attached document for figure. I'm confused by this problem. Along the positive y axis, we have a postive charge of Q. On the negative y axis, we have 2Q, which I also assume is a positive charge. Hence because Q at the origin is also at the center, I thought that both charges would repel this Q to stay at the center because like charges repel each other. I'm not sure how to show this though with Coloumb's Law since from that point of view, Q isn't going anywhere so there would be no change in distance...