1. The problem statement, all variables and given/known data Three charges are arranged as presented below. Q1= 5.00E-9C, Q2= 6.00E-9C and Q3= -7.00E-9C. http://img15.imageshack.us/img15/9250/physicskf.png [Broken] D) Find the direction of the above electric field using the polar coordinate system 0°< θ <360° 2. Relevant equations tan θ = o/a 3. The attempt at a solution I found my E1 = 500 E2 = 5400 E3 = -700 Ex = 500 cos 18.4° + (-700) = -225.6 Ey = 500 sin 18.4° + 5400 = 5557.8 But the angle that I got was incorrect which was 24.63°. Help anyone?