Question

The potential of dipole at its axial position is proportional to distance r as:

• A. $r^{-2}$
• B. $r^{-1}$
• C. $r$
• D. $r^0$

Answer 1

Answer: (A)

The electric potential of electric dipole on its axial position is
$V=\frac{p}{4\pi {\epsilon }_0{r}^2}$
where $p=$ dipole moment
or $V\propto \frac{1}{r^2}$
or $V\propto r^{-2}$