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Four identical point charges (q = +10.0 µC) are located on the corners of a rectangle as shown in Figure. The dimensions of the rectangle are L = 55.0 cm and W = 25.0 cm. Calculate the magnitude and direction of the resultant electric force exerted on the charge at the lower left corner by the other three charges.

1283_Four identical point charges are located on the corners of a rectangle.gif

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