why magnetic field lines are closed curves
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as the emerge from north and merge at south
ragulshankar:
It is because the north and the South Pole are quite opposite to each other and the Earth is round in shape
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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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