The electric potential at a point in an electric field is defined as the work done in bringing a unit positive charge from infinity distance to that point against the electric field.
Here we consider that the electric field of the charge and at an infinite distance from it, field strength is zero because the electric potential is more than field strength produced by the charge at infinity.
If an amount of workdone W is done in bringing a test charge q from an infinity to a point against the electric field, then the potential at that point is given by
V=W/q
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