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1 mu C charge is shifted from A to B, an...

`1 mu C` charge is shifted from A to B, and it is found that work done by an external force is `40 mu J`. In doing so against electrostatic forces, find potential difference `V_A - V_B`.

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`(W_(AB))_("ext") = q(V_(B) - V_(A))`
`rArr 40 mu J = 1 mu C (V_(B) - V_(A))`
`rArr V_(A) - V_(B) = - 40`
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