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  4. The work done in bringing a unit positive charge from infinite distance to a point at distance x from a positive charge Q is W. Then the potential φ at that point is

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Q. The work done in bringing a unit positive charge from infinite distance to a point at distance $x$ from a positive charge $Q$ is $W$. Then the potential $\phi$ at that point is

Electrostatic Potential and Capacitance

Solution:

Electric potential at a point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point.
Or, $V=\frac{W}{q}$
Since charge is of magnitude unity, Hence electric potential at that point will be equal to the work done
$\therefore \phi= W$