Question

explain that magnetic lines of forces are closed curves​

Answer 1

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Magnetic field lines represent continuous curves that originate at the north pole of a magnet and end at the south pole. Inside the magnet they travel from the south pole to the north pole. ... So there is no source or a sink for magnetic field lines. The net flux of the magnetic field through any closedsurface is zero.


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Answer 2

yes magnetic field line make close loop , as out side the magnet, magnetic field line are come out off from north pole they  make curve and reaches to the south pole. then inside the magnet , magnetic field line travel from south pole to north pole .