Mention the properties of Magnetic field lines?

Explanation

(i) Magnetic field lines are continuous closed curves. The direction of magnetic field lines is from North pole to South pole outside the magnet and South pole to North pole inside the magnet.
(ii) The direction of magnetic field any point on the curve is known by drawing tangent to the magnetic line of force at that point.
(iii) Magnetic field lines never intersect each other.
(iv) The degree of closeness of the field lines determines the relative strength of the magnetic field. The magnetic field is strong where magnetic field lines crowd and weak where ,magnetic field lines thin out.