This question is regarding the magnetic field lines around two abutting alternating poles. Take two axially magnetised disc magnets and place them next to each other (like tangent circles), so on each side the adjacent or neighboring magnet is of the opposite pole. By sprinkling iron filings on the surface of these two abutting alternating pole magnets you can see the magnetic field lines closing out by leaving the north pole of one magnet and entering the south pole of the adjacent magnet. That is until you get far enough away from the adjacent magnet, that the field lines now leave the north pole of the magnet, go in the opposite direction and enter the south pole of the same magnet. That is instead of field lines being directed to the opposite pole of the adjacent magnetic body, they are directed to the opposite pole of the same magnetic body (underneath). Does the point at which the field lines change from being directed to the adjacent magnetic body to the same magnetic body have a name and is it possible to calculate where this point exists assuming both magnets are identical in size and material? (I hope my description is adequate, let me know if I should add a photo). Thank you.