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3)  14 point charges of +1.7 micro-coulombs are placed on the perimeter of a circle. Also, charges...

3)  14 point charges of +1.7 micro-coulombs are placed on the perimeter of a circle. Also, charges of -3.8 micro-coulombs, -4.8 micro-coulombs, and -1.8 micro-coulombs are also placed on this perimeter as well. The circle's radius is then decreased by a factor of 5 and this causes the total potential at the center of the circle to increase by 75 x 103 Volts. What is the original radius of the circle in meters?

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