A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to

• A

  ${\mathrm{p}}^{-1}\text{ and }{\mathrm{r}}^{-2}$

• B

  $\mathrm{p}\text{ and }{\mathrm{r}}^{-2}$

• C

  ${\mathrm{p}}^2\text{ and }{\mathrm{r}}^{-3}$

• D

  $\mathrm{p}\text{ and }{\mathrm{r}}^{-3}$