Okay, I completely forgot about the sign changes between quadrants. My question though is why is point 3 180 - 37.3? Cosine is postive in Quadrant IV, I'm just not sure why 180 is being used to get the angle. Thanks!
Homework Statement
Given 3 point charges as follows:
1) a +2.5uC charge at (-0.20m , 0.15m)
2) a -4.8uC charge at (0.50m , -0.35m)
3) a -6.3uC charge at (-0.42m , 0.32m)
What is the electric field at the origin (0,0)?
Homework Equations
E = (k * q) / (r^2) (To find the...