Three point charges are arranged as shown in the figure below. (Take q1 = 5.70 nC, q2 = 4.60 nC, and q3 = -2.79 nC.)
(a) Find the magnitude of the electric force on the particle at the origin.
(b) Find the direction of the electric force on the particle at the origin.
2° (counter-clockwise from the +x-axis)
Fab= k q1q2/r2
The Attempt at a Solution
I am attaching a photo of my last attempt to do this problem but I really think that I don't know what I am doing. I think I am using the wrong length and so I can't get the magnitude right. I can't even get to the direction part but I can't do that either because I don't know if I'm supposed to use sin or cos.