The correct expression for the potential at a point distance r from a charge q in an electric field is?
A
_q24πεor2
B
_q24πεor
C
_q4πεor2
D
\(\frac{q}{4πε_or}\)
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Electric potential is work done in taking a unit mass or charge from infinity to that point
V = \(\frac{\text{W}}{\text{Q}}\) = \(\frac{\text{Fr}}{\text{Q}}\) = \(\frac{Q_1Q_2}{4\piεor^2}\) x \(\frac{\text{r}}{Q_1}\)
= \(\frac{- q}{4\piεor}\)
Source: Myschool Past Questions Archive (Record #14526)