Four point charges of equal magnitudes but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure.Which one of the arrows shown represents the sum of the forces exerted on the center charge?

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The Answer of Four point charges of equal magnitudes but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure.Which one of the arrows shown represents the sum of the forces exerted on the center charge?

Four Point Charges of Equal Magnitudes but with Varying Signs