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Four 4.0 x10-5 C charges are arranged in a square with sides of 25 cm. If...

Four 4.0 x10-5 C charges are arranged in a square with sides of 25 cm. If three of the charges are positive and the other negative, what is the voltage at the center of the square (assuming V=0 at an infinite distance from the charges)? How much energy must be input (or released) to bring a negative 2.0 x10-6C charge from a far distance to the center of the square?

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