I have a question that I've worked out and am having a bit of difficulty with. The problem is: http://synthdriven.com/images/deletable/help3.jpg This is what I've worked out: (sorry, it's a bit faint.) http://synthdriven.com/images/deletable/help2.jpg What I did. I drew a diagram of the electrical forces acting on the point charge in question. I used Coloumb's law to find F for each. I then broke F1 and F2 down into vector components. It's obvious from the diagram that the x-components are going to cancel each other out... So that should leave a resultant force going in the -y direction. Can someone look at this and tell me what I've done wrong? According to this I should be getting a 0 resultant force. Which is stupid. I've been long out of practice when it comes to vectors, but I think what I've done wrong lies more around the F1 and F2 magnitude... Is it the signs?? Thanks!