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A charge of 10C is moved in an electric ...

A charge of 10C is moved in an electric field of a fixed charge distribution from point A to another point B slowly. The work done by external agent in doing so is 100J. What is the potential difference `V_(A)-V_(B)`?

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`V_(A)-V_(B) =(U_(A)-U_(B))/(q)= (W_("ext"))/(q) .` Here `W_("ext")` is work done in moving the charge from B to A `i.e- 100 J implies V_(A)-V_(B)=-10` volts .
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