A charge q1=5.00 mC is located at the origin of a coordinate system. Another charge q2=4.90 mC is located at x=-3.50 m and y=-4.00 m, and another q3=4.80 mC is located at x=-4.20 m and y=4.40 m. Calculate the magnitude of the net electric force on the charge q1 in Newtons (N).