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    Work done by a uniform Ring of Charge (due tomorrow

    Homework Statement A ring of diameter 7.90 cm is fixed in place and carries a charge of 5.20 μC uniformly spread over its circumference. How much work does it take to move a tiny 3.40 μC charged ball of mass 1.50 g from very far away to the center of the ring? Homework Equations V=(KQ)/r^2...