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37 charges of +13 micro-coulombs and 7 charges of -13 micro-coulombs lie on the perimeter of...

37 charges of +13 micro-coulombs and 7 charges of -13 micro-coulombs lie on the perimeter of a circle with a radius of 2.1 m (not a large circle). What is the electric potential energy of a charge of -22 micro-coulombs placed at the center of the circle due to the charges on the perimeter, in Joules? If negative, include a negative sign.

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