The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about "its perpendicular axis, the electric field at the same point will be
When the dipole is rotated through at an angle of 90° about its perpendicular axis, then given point comes out to be on equator. So, field will become E/2 at the given point.