# 2 pairs of magnetic dipoles

1. Feb 21, 2014

### Mr.Bomzh

Hi , I am interested to know how would the magnetic field lines be formed and what effect each one of them would have to the one next to the other in such a configuration. I have two pairs of magnets.

Distance between each magnet in a pair , numbered 2, is 2 mm. the distance between the two pairs of magnets , numbered 1 is 1cm.

In one pair the magnets stand NS in the other they are opposite SN, this is not a homework I was just interested what happens in such a configuration , if the distance between opposite magnets in a pair is smaller than that of the same opposite magnets between the pairs do most strength of field goes between the pair or is it shared also with the side pair even though it is further? I hope you understand my question , thank you :)

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2. Feb 21, 2014

### Simon Bridge

If I understand that diagram correctly, you mean that the poles are on the large faces of the slabs - which are supposed to represent permanent magnets.

The front pair are oriented with S (left) and N (right) poles facing the front.
I cannot tell what the orientation of the back pair is supposed to be from the diagram.
From your description, the back pair are N (left) and S (right) poles facing front.

If you draw the situation from overhead, you should be able to sketch in the field line following the usual rules.
If all magnets are equal strength, then don't expect flux from back left N pole to attach the front right S pole.

Relative separations would be important but I cannot see any magnet dimensions.
For complicated configurations of magnets, I'd usually want to go to the vector potential.
You can always just add the fields due to four dipoles?

The effect, when released, is that the magnets will rotate and come together in a heap.

3. Feb 22, 2014

### Mr.Bomzh

Hi Simon , well , I edited the picture for better understanding , the magnet pairs are the ones colored with similar color dots on their sides.the so called poles are the inner faces of the magnet slabs. the ones who face each other.

Now the magnet slabs are not loose they are attached to a armature so to speak of.the distance number 2. is smaller than the distance number 1. also the distance number 1. is the distance between the two pairs of magnets not distance number 2.

Especially if the magnetized parts are the ones facing each other in the pairs , I think the main field lines would be between each opf the two slabs in a pair right?

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4. Feb 22, 2014