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  4. Work done by an external force in bringing a unit positive charge from infinity to a point is

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Q. Work done by an external force in bringing a unit positive charge from infinity to a point is

Electrostatic Potential and Capacitance

Solution:

Considering potential to be zero at infinity. Work done by an external force in bringing a unit positive charge from infinity to a point without acceleration
$=-$ Work done by electrostatic forces
$=$ Electrostatic potential $(V)$ at that point