1. The problem statement, all variables and given/known data A +20nC point charge is placed on the x axis at x = 2.0 m, and a -25 nC point charge is placed on the y axis at y= -3.0 m. What is the angle that the direction of the electric field at the origin makes with the x-axis. (a) 209 (deg) (b) 61 (deg) (c) 29 (deg) (d) 241(deg) (e) 119 (deg) 2. Relevant equations E = ke(q/r^2) 3. The attempt at a solution E= (8.99x10^9) [ (20x10^-9)/4 (i) - (25x10^-9)/9 (j)] = (8.99x10^9) [ 5.0x10^-9 (i) - 2.78x10^-9 (j)] = 44.95i - 24.97j = 51.42 The angle between the x-axis is arccos(44.95/51.42) = 29 (deg) But the correct answer is 209 (deg).