Three point charges, Q1 = 21.4 μC, Q2 = −34.6 μC, and Q3 = 67.3 μC are positioned at three corners of a square as shown in the figure. A fourth point charge is located at the open corner at point A with a charge of QA = 17.5 μC. The square has height y of 60.1 cm and width x of 60.1 cm. Calculate the magnitude F of the net force on the charge at point A. F =