Why do magnetic lines of force, go from south to north internally???i know the path externally , butcan;tunderstand the internal concept..please explaini am in x class..thnx..(raman)

consider electric lines of force. They go out of a positive charge and terminate on a negative charge. Now think of two electric charges of equal magnitude, but opposite sign. This is an electric DIPOLE. The shape/pattern of electric lines of force is the same as that of the magnetic lines of force, because the magnet is a magnetic DIPOLE. According to Maxwell's electromagnetic equations, magnets are found only in dipoles, MONOPOLES do not exist.