Why is electric potential is said to be the work done to move a positive charge but not a negative charge as flow of negative charges gives current

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Solution

Electric potential of a point in an electric field is defined as the work done by an external agency on a unit positive charge in moving it from infinity to that point on the field.
The positive charge is chosen as convention. A negative charge will also give the same result but with an opposite sign as compared to the results derived using the positive charge.

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