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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) = (kqq0)/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 velocityf, I can just use conservation of energy and solve for velocity. So, KEf = sqrt{-2PEf/m}
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