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Why are the magnetic field lines colsed curves |
| Answer» 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.A magnetic dipole ( North pole and South pole pair) produces a field whose lines do not start or do not end at some point. A field line either extends towards an infinity or forms a close loop.Electric fields can originate even when there is a single charge present and they can end on another charge or exist that way. But there is NO isolated magnetic pole or a monopole. They always come in N-S pairs. So there is no source or a sink for magnetic field lines.The net flux of the magnetic field through any closed surface is zero. All the field lines that enter through the surface into a volume enclosed by the surface also exit through the surface.Hence Magnetic field lines always are closed loops. | |