Electric Field due to an electric dipole on axial and equitorial points

Electric field due to an electric dipole is

Electric Field due to Dipole

The electrostatic potnetial due to an electric dipole at an equatorial point is

The angle between the electric dipole moment and electric field due to the dipole on its axial and equatorial lines respectively are

What is the angle between the directions of electric field due to an electric dipole and its dipole moment at any : (i) Axial p oint . (ii) Equatorial point .

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