Write two properties of magnetic field lines.


Two properties of magnetic field lines are:
They never cross one another.
They flow from the south pole to the north pole within the magnet and north pole to south pole outside the magnet.

Final Answer:

Hence, the two properties of magnetic field lines are
(a) They never cross one another.
(b)They flow from the south pole to the north pole within the magnet and north pole to south pole outside the magnet.