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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
intergral of k(Qq)/r^2 *ds= work done
work done= - (change in potential energy)
work done= F dot delta S (otherwise known as displacement)
The Attempt at a Solution
First i realized that force=Eq and that the force felt would be changing due to how far away the charge was from the uniform circle. So i setup
intergral of K(Qq)/r^2*ds from r to infinity
i got -KQq/r as my indefinite intergral, which i thought was the electric potential.energy
(K(3.4*10^-6)*(5.2*10^-6))/0.079= 2.01= electric potential energy ( at infinity it would be 0).
Specific advice would be incredibly helpful