Magnetic dipole-dividing plane

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Dipole-Dividing Plane

It is well known that the electricity flowing through a coil (solenoid) produces magnetic field. If the current is fixed, the produced magnet is permanent and bipolar (N and S poles), depending on the direction of the flowing electricity. One of the most popular experiments uses this arrangement to prove that the field inside the solenoid is homogenous, because the iron particles inside the solenoid form lines which are parallel.

This very simple experiment tough, showed us different patterns, that have remained unnoticed till now.

The experimental arrangement consists of a vertically set solenoid, inside which there is a small plastic vessel. The liquid of the vessel used in this experiment in the vessel is glycerine, on the surface of with are sprinkled very fine iron dust particles.


As it can be seen in the enclose photos of the experiment, changing the position of the vessel inside the solenoid, simply by moving the coil up and down, leads to the formation of different patterns by the iron particles.


Image:ddpdichev01.png Image:ddpdichev3.png
Position 1 (N pole)

Image:ddpdichev2.png
Position 2
Image:ddpdichev02.png Image:ddpdichev1.png
Position 3
Image:ddpdichev03.png Image:ddpdichev5.png
Position 4

Image:ddpdichev4.png
Position 5 (S pole)



In top and bottom positions ( 1 and 5) the patterns formed are concentric arcs (well knowed Dichev's rings), while in the middle (pos. 3) the pattern formed is parallel lines. These parallel lines formed in the geometric middle of the solenoid I decided to name dipole-dividing plane, because of the stunning fact, that the shortest chords in this plane have dipole properties.

If we move the solenoid upwards (pos.4), the parallel lines bend towards the shortest chord, thus forming one of the poles. And if we move the solenoid downwards (pos.2), then the parallel lines bend towards the other shortest chord only to form the other pole.

Thinking of the permanent magnet as an equivalent of the solenoid, where we witnessed facts described here and unknown until now, new questions emerge. New question related to the magnetostatics in general and more questions, related to palaeomagnetism and the new global tectonics. The iron dust floating over glycerin forms pictures which resemble the equator and the parallels of the spread globe. The future will show if such a dependancy exists.

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