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Unformatted text preview: P20.69 From Example 20.5, the potential at the center of the ring is V i = k e Q R and the potential at an infinite distance from the ring is V f = . Thus, the initial and final potential energies of the point charge-ring system are: U i = QV i = k e Q 2 R and U f = QV f = . From conservation of energy, K f + U f = K i + U i or 1 2 Mv f 2 + = + k e Q 2 R giving v f = 2 k e Q 2 MR ....
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