Two equal charges $q$ of opposite sign separated by a distance $2a$ constitute an electric dipole of dipole moment $p$. If $P$ is a point at a distance $r$ from the centre of the dipole and the line joining the centre of the dipole to this point makes an angle $\theta$ with the axis of the dipole,then the potential at $P$ is given by $(r \gg 2a)$ (where $p = 2qa$).

• A
  $V = \frac{p \cos \theta}{4 \pi \varepsilon_0 r^2}$
• B
  $V = \frac{p \cos \theta}{4 \pi \varepsilon_0 r}$
• C
  $V = \frac{p \sin \theta}{4 \pi \varepsilon_0 r}$
• D
  $V = \frac{p \cos \theta}{2 \pi \varepsilon_0 r^2}$