(Answered) 19 charges of 43 micro-coulombs and 10 charges of -43

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19 charges of +4.3 micro-coulombs and 10 charges of -4.3 micro-coulombs lie on the perimeter of a circle with a radius of 4.7 km (yes it's a large circle). What is the total potential at the center of the circle produced by these charges in volts? If negative, include a negative sign.

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