At each point in the magnetic field lines can draw only one magnetic field lines passing through.
The magnetic field lines are closed curve. Where the magnet, the magnet outside the magnetic field lines come out and go to the North Pole south pole of the magnet.
The magnetic field lines do not intersect.
Where larger magnetic induction, the magnetic field lines in that drawing mau more (thicker), where smaller magnetic induction magnetic field lines in that drawing more sparse.
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