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dwstrait

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## Homework Statement

A ring of diameter 7.90 cm is fixed in place and carries a charge of 5.90 [tex]\mu[/tex]C uniformly spread over its circumference. How much work does it take to move a tiny 3.80 [tex]\mu[/tex]C charged ball of mass 1.90 g from very far away to the center of the ring? Also, What is the maximum speed it will reach?

## Homework Equations

W = -[tex]\Delta[/tex]U

U(r) = (kqq

_{0})/r

KE + PE = 0

## The Attempt at a Solution

In order to get the work it takes to move the particle, I figured I could find the change in the Potential Energy. The potential energy when the particle is very far away is zero. Is there a better way to approach the problem than using PE?

In order to find velocity

_{f}, I can just use conservation of energy and solve for velocity. So, KE

_{f}= sqrt{-2PE

_{f}/m}

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