Before my presentation i give some recalls:
- Magnetic fields are represented by close loops, because to show that they have no begins and end, in magnets they oriented as N-S-N.
- The production of magnetic field only responsible for current.
- Current can produced by relative motion of chareges
- How magnetic field produced by around the magnets.
- How the magnetic strength more at the poles.
The curved lines are magnetic filed lines(or force lines).
I can show how they originates, from my f recall 2 i said that current only responsible for magnets, but where is the current in magnet. Current is the flow of charge(electrons).So every substances have electrons they moves around orbit and spins its own axis and produce a current(Ampere's current).Therefore they produced magnetic fields so you can ask then every substance could produce magnetic fields, but they won't. Yes of course your question is correct, there is a problem the all electrons doesn't revolves around the atom at same plane, therefore most of the substance the magnetic fields cancels each other. But some substance there exists small fields, they are the responsible for magnetic fields in some substances.But there is another current and field by its own spin. But it is only possible in substances having odd number of electron because if it is even the all electron will paired and cancel its field. Then i come back to my problem, look at the below figure.
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| fig 1 |
It shows the magnetic field produced by the atom in the magnetic substance.The center is shows a current element and the arrow shows the magnetic field direction. There are several loop in the magnet we can figure out the a few loops in magnet the figure 2 shows that.The square is show the small portion of magnet and you can see a loop of marked as violet arrow shows the effective magnetic loop, how the effective field is involve, that is simple the loop surrounded by the magnet.
there are several portions like the fig.2 in the magnet which gives high intense magnetic field just like the fig.3 from this figure we can easily noticed that number of magnetic loops are higher at the poles. This is the reason for the magnetic field intensity greater at poles.
there are several portions like the fig.2 in the magnet which gives high intense magnetic field just like the fig.3 from this figure we can easily noticed that number of magnetic loops are higher at the poles. This is the reason for the magnetic field intensity greater at poles.




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