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Three point-like charges are placed at the corners of a square as shown in the figure, 26.0 cm on each side.

Three point-like charges are placed at the corners of a square as shown in the figure, 26.0 cm on each side. What is the minimum amount of work required by an EXTERNAL force to move the charge q3 to infinity? Let q1 = −27.0 µC, q2 = −31.0 µC, q3 = +47.0 µC.

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