Question

The electric potential due to a small electric dipole at a large distance $r$ from the centre of the dipole is proportional to :

• A. $r$
• B. $1/r$
• C. $1/r^2$
• D. $1/r^3$

Answer 1

The correct option is C $1/r^2$

The potential at a distance r due to dipole is $V_{dip}\left(r\right)=\frac{1}{4\pi {ϵ}_0}\frac{\overrightarrow{p}.\hat{r}}{r^2}$ where $\overrightarrow{p}=$ dipole moment.

Thus, $V_{dip}\left(r\right)\propto \frac{1}{r^2}$