why magnetic field line always starts from north to south
Answers
Answer:
Magnetic Field Lines. Unlike Poles Attract Each Other. ... If on the other hand, the like poles, i.e. the north and the north pole (or the south and the south pole) are placed close to each other, the magnets do not link and the magnets repel each other. This is why the needle in a compass always points north/south.
Explanation:
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Explanation:
The North Pole of a magnet is short for 'North-seeking pole'. It is the pole that settles down to point roughly geographically North when the magnet is suspended so that it can turn freely about a vertical axis, and is well away from sources of magnetic fields other than the Earth.
The direction of a magnetic field at a point P due to any source, such as a magnet or a current-carrying wire, may now be defined as the direction in which the North Pole of a freely suspended magnet (basically a magnetic compass) points at P (having subtracted vectorially the effect of the Earth's field at P). [The magnet's or the wire's field at P may well be much stronger than the Earth's field, which served its purpose earlier in allowing us to name the poles of magnets, but may now be negligible compared with the field we're investigating.]
A magnetic field line is a line whose direction at any point along it is the direction of the magnetic field at that point.
We can now deduce that, outside a magnet, its magnet field lines will go from the North Pole of the magnet to the South. It's because (a) a field line tells us the direction of the field at each point along it, and (b) the direction of the field is the direction in which the North Pole of a compass points and (c) the North Pole of the compass will be repelled by the North Pole of the magnet and so points away from it!
[Magnetic field lines are closed loops, so inside the magnet, they will run from South to North. This doesn't contradict what we've said before, which applies on the assumption of being external to sources of magnetic fields.]
[All this stuff about suspended magnets and compasses may seem outdated. There are other ways to determine which pole of a magnet is which and to determine the direction of a magnetic field.