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Find work done to bring a rest charge q(...

Find work done to bring a rest charge `q_(0)` from point A to point B, slowly. All parameters are in S.I. units.

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`W_(A rarr B) = U_(B) - U_(A) = q_(0) (V_(B) - V_(A))`
`= [-(K(qa))/(125) - ((K(qa)(7))/(125))]`
`rArr W_(A rarr B) = (Kq q_(0)a)/(125)(8)`
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