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Properties of magnetic field lines:

1. They never intersect one another.
2. The density of the magnetic field lines decreases with increasing distance from the poles. The density is maximum at poles.
3. They flow from the south pole to the north pole within a material and north pole to south pole in air.
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They seek the path of least resistance between opposite magnetic poles. In a single bar magnet as shown to the right, they attempt to formclosed loops from pole to pole. They never cross one another.
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