Why don't two magnetic field lines intersect each other?

Depict the field line pattern due to a current carrying solenoid of finite length. (i) In what way do these lines differ from those due to an electric dipole. (ii) Why can't two magnetic field lines intersect each other?

Why do two electric field lines not intersect each other ?

Why don't two magnetic lines of force intersect each other ?

Why can't two magnetic field lines cross each other? Draw the magnetic field lines (including field directions) of the magnetic field due to a long straight solenoid. What important property of this field is indicated by this field line pattern? Name any two factors on which the magnitude of the magnetic field due to this solenoid depends.