, it is
brought with infinitesimally slow constant speed In
this situation, work done by the external force is the negative of the work
done by the electric force, and gets fully stored in the form of potential
energy of the charge q If the external force is removed on reaching P, the
electric force will take the charge away from Q – the stored energy (potential
energy) at P is used to provide kinetic energy to the charge q in such a
way that the sum of the kinetic and potential energies is conserved Thus, work done by external forces in moving a charge q from R to P is
WRP =   
        =    –
 (2