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Q.
Work done by external forces in moving a charge $q$ from $R$ to $P$ as shown in figure is
Electrostatic Potential and Capacitance
Solution:
Thus, work done by external forces in moving a charge $q$ from $R$ to $P$ is
$W_{R P}=\int\limits_{R}^{P} F _{ ext } \cdot d r =-\int\limits_{R}^{P} F _{E} \cdot d r$
