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

J & K CETJ & K CET 2008Electrostatic Potential and Capacitance

Solution:

Electric potential at a point in an electric field is defined as the potential energy per unit charge, and which is equal to work done in bringing a unit positive charge from infinity to that point.
$\therefore \phi= W$