(1) The magnetic field lines emerge from north pole and merge at the south pole outside the magnet, while inside the magnet the direction of field lines is from its south pole to its north pole.
Thus, the magnetic field lines are closed and continuous curve.
(2) The magnetic field lines are crowded near the pole where the magnetic field is strong and are far apart near the middle of the magnet and far from the magnet where the magnetic field is weak.
(3) The magnetic field lines never intersect each other because if they do so, there would be two directions of magnetic field at that point which is absurd.
(4) In case the field lines ato parallel and equidistant, these represent a uniform magnetic field.Important note: The relative strength of the magnetic field is shown by the degree of closeness of the field lines.
Important note : the relative strength of the magnetic field is shown by the degree of closeness of the field lines.