Here's the question you clicked on:
haganmc
The net force on the 1.0 nC charge in the figure is zero. What is q? Here is the figure http://session.masteringphysics.com/problemAsset/1169215/1/jfk.Figure.20.P53.jpg
refresh my mind, what is coulombs equation?
|dw:1346204638555:dw| find F then find the y component of F multiply that by 2 2F is then equal to the force between the +1nC and q solve for q then
columbs law F=(k*q1*q2)/r^2
i gave you the steps, you should be smart enough to figure it out
k=? and are you converting cm to m?
you can calculate out the angle for yourself |dw:1346205867449:dw|
|dw:1346205900178:dw| theta = arctan (2/3)