since no one answer i edit it again.(adsbygoogle = window.adsbygoogle || []).push({});

we got the forumla,

v1-v0= the negative integral 0f E dot with dr from 0 to 1.

So assume we are moving a positive point charge from infinity against the electric field emits by a positive source charge to location p.

since E=f/q, and f dot dr = fdrcos180, then, the answer would be a positive number. is this true?

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# Homework Help: [extremely easy question] the sign (+v or -ve) of potential energy

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