I Four charges are located on the corners on of a square. The sides of the square have a length of 0.05 m. The upper left corner has a charge of q. the upper right corner has a charge of - q. the lower left corner has a charge of 2q, and the lower right comer has a charge of -2q. If the magnitude of q is 107 C, find the magnitude of the force exerted on the charge at the lower left corner of this system.