The electric field at a point on equatorial line of a dipole and direction of the dipole moment

Given Data: Electric field at a point

Concept Used: Electric dipole moment 

Detailed Solution:

- The electric field on the equatorial line 

$\overrightarrow{E_{eq}}=\frac{-1}{4\pi {ϵ}_0}\frac{\dot{P}}{r^3}$

And the direction of the electric dipole moment is from negative to the positive charge 

Hence the dipole moment will be in opposite direction to electric field.