Explanation:

The direction of electric field lines is from positive to negative charges. On the other hand, the direction of the dipole moment is from negative to positive charges. This is because of the following reasons:

Definition of Dipole Moment:
A dipole moment is defined as the product of the magnitude of the charge (q) and the distance (r) between the two charges, multiplied by the direction of the separation vector (r) between the two charges.

The Electric Field of a Dipole:
An electric field is created when there is a separation of charges. In the case of a dipole, there is a positive charge and a negative charge separated by a distance. The electric field of a dipole is the sum of the electric fields created by the positive and negative charges.

Opposite Direction of Dipole Moment and Electric Field Lines:
The direction of the dipole moment is opposite to that of the electric field lines because the electric field lines originate from the positive charge and terminate at the negative charge. The dipole moment, on the other hand, points from the negative charge to the positive charge.

Conclusion:
In summary, the direction of the dipole moment is opposite to that of the electric field lines because the dipole moment is the product of the separation vector between the charges and the charge on each of the charges. The electric field lines originate from the positive charge and terminate at the negative charge.