Properties of magnetic lines of force:
(i) Magnetic lines of forces are closed continuous curves, extending through the body of the magnet.
(ii) The direction of line of force is from North Pole to south pole outside the magnet while it is from south pole to north pole inside the magnet.
(iii) The tangent to the magnetic line of force at any point gives the direction of magnetic field at that point, (i.e) it gives the direction of magnetic induction (B) at that point.
(iv) They never intersect each other.
(v) The crowd where the magnetic field is strong and thin out where the field is weak.