A particle with charge 3.1 C is placed at the origin. Another particle, with charge 3.1 C, is placed 4.0 m from the origin on the x-axis, and a third particle, with charge 3.7 C, is placed 1.5 m from the origin on the y-axis. The magnitude of the force on the particle at the origin is (hint - don't round too much! Try 3 sig figs):