B (0,0) is the 90 angle of the ABC triangle with A (0, 3.0m) and C (4.0m, Om). Point charges of 6.0 nC (at B), -2.0 nC (at A) and 5.0 nC (at C) are placed at the vertices of the triangle. Determine the net Coulomb force on the charge at point C. Write the answer for two decimal points without units