How to draw the field lines due to a dipole?
Fig. 1 depicts the field lines due to a dipole.
For a dipole, field lines start from the positive charge and terminate on the negative charge.
The number of lines leaving the positive charge is equal to the number of lines terminating on the negative charge.
A tangent at any point on field line gives the direction of electric field at that point.
Two field lines never cross each other.