Question: Three point charges, -5.8 10-9 C, -9.0 10-9 C, and +7.3 10-9 C, are fixed at different positions on a circle. The

Three point charges, -5.8 × 10-9 C, -9.0 × 10-9 C, and +7.3 × 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2100 V. What is the radius of the circle?

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