1. The problem statement, all variables and given/known data Four charges, q1 = +145 µC, q2 = +55 µC, q3 = −150 µC, and q4 = +27 µC, are fixed at the corners of a 4 m by 5 m rectangle, as illustrated in the figure below. What are the magnitude (in N) and the direction (in degrees counterclockwise from the +x-axis) of the net force acting on q1? (Assume the x-axis extends from q1 to the right.) 2. Relevant equations 1. Fe = (kq1q2)/(r2) 2. a2 + b2 = c2 3. Fx = Fsinθ 4. Fy = Fcosθ 3. The attempt at a solution 1. I determined the distance between charges 1/3 & 2/4 using Pythagorean theorem. 2. I solved for the forces between all charges using equation 1. I solved for the forces between 1/2, 3/4, 1/4, 2/3, 1/3, and 2/4. 3. I resolved forces 1/3 and 2/4 into x and y components using equations 3 & 4. 4. I add all x components together and all y components together. 5. I used equation 2 to get the overall magnitude of the x+y components.