Magnetic Field Lines #8211; The magnetic field lines are imaginary lines, tangent on these lines at a particular point gives the direction of magnetic field at that point. (i) Magnetic field lines of a magnet from closed continuous loops, (ii) Unlike electric field lines, magnetic field lines are directed from North to South outside a magnet and they run from South to North pole inside the magnet, (iii) Two magnetic field lines cannot intersect each other.