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Four identical charged particles (a = +10.3 UC) are located on the corners of a rectangle as shown in the figure below. The dimensions of the rectangle are L = 55.8 cm and W = 14.8 cm. La (a) Calculate the magnitude of the total electric force exerted on the charge at the lower left corner by the other three charges. (b) Calculate the direction of the total electric force exerted on the charge at the lower left corner by the other three charges. (counterclockwise from the +x-axis)