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Properties (or Characteristics) of the Magnetic Field Lines.

1. The magnetic field lines originate from the north pole of a magnet and end at its south pole.

2. The magnetic field lines come closer to one another near the poles of a magnet but they are widely separated at other places. A north magnetic pole experiences a stronger force when it approaches one of the poles of the magnet. This means that the magnetic field is stronger near the poles. From this we conclude that where magnetic field lines are closer together, it indicates a stronger magnetic field. On the other hand, when magnetic field lines are widely separated, then it indicates a weak magnetic field. 

3. The magnetic field lines do not intersect (or cross) one another. This is due to the fact that the resultant force on a north pole at any point can be only in one direction. But if the two magnetic field lines intersect one another, then the resultant force on a north pole placed at the point of intersection will be along two directions, which is not possible.