Solve the all parts of following question:
Question: Two charges are located on the x axis: q1 = +4.7C at x1 = +3.5 cm, and q2 = +6.6C at x2 = -3.3 cm. Two other charges are located on the y axis: q3 = +3.9C at y3 = +8.6 cm, and q4 = -5.0C at y4 = +6.4 cm.
Part A: Find the magnitude of the net electric field at the origin?
Part B: Find the direction of the net electric field at the origin. Specify the direction as an angle with respect to the +x direction.
I need help to find the magnitude of the net electric field at the origin.