Refrigerator magnets with four poles apiece

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Discussion Overview

The discussion revolves around the properties and behavior of bar magnets, particularly those with multiple poles. Participants explore the nature of magnetic poles, their arrangement, and the implications of these configurations in practical applications, such as refrigerator magnets. The conversation includes both theoretical considerations and experimental observations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant observed that their bar magnets appeared to have four poles, with each half magnetized oppositely, suggesting a unique configuration that differs from traditional representations.
  • Another participant referenced the Hallbach array, noting its magnetic properties, but later clarified that the magnets in question were two-sided and symmetrical.
  • Some participants asserted that magnetic poles come in pairs, while others challenged this notion by referencing a linked discussion about three-poled magnets.
  • There was a suggestion that the definition of a magnetic pole could influence the interpretation of the number of poles present in a given configuration.
  • A participant shared their experimental findings with refrigerator strip magnets, noting the arrangement of poles in strips and how they interact based on orientation.

Areas of Agreement / Disagreement

Participants express differing views on the nature and definition of magnetic poles, with some asserting that poles come in pairs while others argue for the existence of multiple poles based on specific configurations. The discussion remains unresolved regarding the exact nature of these poles and their definitions.

Contextual Notes

The discussion highlights the ambiguity in defining magnetic poles and the potential for different interpretations based on experimental observations. There are also references to linked discussions that may provide additional context but do not resolve the current debate.

Hornbein
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I bought a couple of bar magnets at the local hardware store. They were acting so strangely. I couldn't figure out where the poles were. Finally I realized each magnet had four poles! They weren't quadropolar, rather half of each bar was magnetized one way and the other half the other way. The field is oriented towards the thnnest dimension of the bar, not the longest like in all of the diagrams. Pretty clever setup.

I suppose that a permanent magnet could have any number of poles greater than 1.
 
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Hornbein said:
I bought a couple of bar magnets at the local hardware store. They were acting so strangely. I couldn't figure out where the poles were. Finally I realized each magnet had four poles! They weren't quadropolar, rather half of each bar was magnetized one way and the other half the other way. The field is oriented towards the thnnest dimension of the bar, not the longest like in all of the diagrams. Pretty clever setup.

I suppose that a permanent magnet could have any number of poles greater than 1.
Poles come in pairs.
 
davenn said:
there's more than 3 poles in the image in that link

It depends on how a magnetic pole is defined.
 
Hornbein said:
It depends on how a magnetic pole is defined.

no, look at the field lines in the image
I can see 4 distinct poles with an unknown area in the middle
 
  • #10
I recently experimented with two flat refrigerator "strip" magnets each about 1" diameter and placed their backs against each other. By orientating them just right I could maximize the adhesion. A little experimentation by sliding one of them across showed that the poles came in strips about 1/8" wide from top to bottom so that they would slide easily in the vertical direction but when sliding horizontal they would click into place after every 1/8" -1/4" of motion. A subsequent google confirmed they are manufactured in such a fashion.
 

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