The electric field at a point on the equatorial plane at a distance r from the centre of a dipole having dipole moment  $\overrightarrow{\mathrm{p}}$ is given by, (r >> separation of two charges forming the dipole, ${\mathrm{ϵ}}_0$ - permittivity of free space)

• A

  $\overrightarrow{\mathrm{E}}=-\frac{\overrightarrow{\mathrm{P}}}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^3}$

• B

  $\overrightarrow{\mathrm{E}}=\frac{\overrightarrow{\mathrm{P}}}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^3}$

• C

  $\overrightarrow{\mathrm{E}}=\frac{2\overrightarrow{\mathrm{P}}}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^3}$

• D

  $\overrightarrow{\mathrm{E}}=-\frac{\overrightarrow{\mathrm{P}}}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}$