[sw20 (OP)]

Hi all,

I'm working with a pair of multi-pole neodymium ring magnets (rated ~119lbF, McMaster-Carr part number 2494N17) and finding that if the opposing poles are forced together, with the magnets in alignment, that at very close range (may be a millimeter or two apart?) the two magnets will suddenly snap together as if one has reversed polarity. There is NO electric current involved, but the only resources I am finding about this phenomenom are related to electromagnets and induced magnetism.

Can anyone point me to a source explaining what's happening?

Thank you!

[evan_au]

As they are multi-pole magnets (6 North+6 South on the same side), there will be a rotational force to bring the North pole of one magnet into line with the South pole of the other magnet.
- Since this configuration causes strong attraction, the two magnets will move together (away from your fingers), and you may not feel them rotating by 30° to align.

I suggest that you place a mark on both magnets when they are together (attractive): There are several points, 60° apart where they will be aligned...
- Then separate them
- Press them together when they are misaligned (repulsive)
- When they snap together, see if they are now aligned.

 

[sw20 (OP)]

I have tried that previously, and just did it again many times for the sake of confirming - they will snap together at any rotational alignment. I notice that it is more difficult (requires more force) in some alignments, but the apparent polarity change happens regardless. It's weird!

[Petrochemicals]

Is magnetic force alteratable or does it have to be diffused ?

Edit:

"Polarity of magnetic force" for clarity

[sw20 (OP)]

Petrochemicals, I'm not following your question. I'm working with two permanent magnets, so not alterable in any way.

[Petrochemicals]

Petrochemicals, I'm not following your question. I'm working with two permanent magnets, so not alterable in any way.

if the opposing poles are forced together, with the magnets in alignment, that at very close range (may be a millimeter or two apart?) the two magnets will suddenly snap together as if one has reversed polarity.

It seems to be what you are asking , either the magnets (or at least one) is reversing polarity, or somehow dissipating its force?

[evan_au]

Sudden polarity reversal in opposing permanent magnets?

As they are two identical magnets from the factory, I do not think that one is suddenly reversing polarity.

Especially since, after you separate them, they still have a strong repulsion at certain angles. It's not like one suddenly got demagnetised.

[sw20 (OP)]

With you now. Yes it's clear there is no permanent polarity reversal or full demagnetisation.

Situation appears like a temporary one, but I agree that does not make sense since they are identical factory-produced magnets. Thus the original post.

[hamdani yusuf]

Can you show a diagram for this experiment?