In an electric field, 0.90 joule of work is required to bring 0.45 coulomb of charge from point a to point b. what is the electric potential difference between points a and b?

The difference in electric potential energy between the two points is

where q is the magnitude of the charge and  is the electric potential difference.

But for energy conservation, the difference in electric potential energy  between the two points is equal to the work done to move the charge between A and B:

so we have


and by substituting the numbers of the problem, we find the value of :

Bsame force but in the same direction

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