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  4. For Q<0, V<0, work done (by the external force) per unit positive test charge in bringing it from infinity to the point is negative. This is equivalent to

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Q. For $Q<0, V<0$, work done (by the external force) per unit positive test charge in bringing it from infinity to the point is negative. This is equivalent to

Electrostatic Potential and Capacitance

Solution:

Work done by the electrostatic force in bringing the unit positive charge from infinity to the point $P$ is positive.