1), we get:
Work done by external force in bringing a unit positive
charge from point R to P
= VP – VR  =
−


U
U
q
P
R
(2 4)
where VP and VR  are the electrostatic potentials at P and R, respectively Note, as before, that it is not the actual value of potential but the potential
difference that is physically significant If, as before, we choose the
potential to be zero at infinity, Eq