Magnetic Pole Reversal: Explaining the Paradox

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Discussion Overview

The discussion revolves around the behavior of magnetic poles when a magnet is cut in half. Participants explore the implications of magnetic field lines and the resulting polarity of the cut edges, questioning common assumptions and interpretations related to magnetism.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions why cutting a magnet results in both edges becoming like poles, suggesting that common sense would imply one edge should be a north pole and the other a south pole.
  • Another participant argues that the cut edges cannot be like poles, as this would imply the existence of a monopole or a sudden flip in polarity.
  • A different participant asserts that when a bar magnet is cut, the original north and south poles remain as such in the new magnets, and questions the initial assumption that the cut ends would become like poles.
  • A later reply reiterates the initial question, expressing frustration at the inability to explain the phenomenon and likening it to other seemingly paradoxical observations.

Areas of Agreement / Disagreement

Participants express disagreement regarding the nature of the poles after cutting a magnet, with some asserting that the cut edges do not become like poles, while the initial question suggests a misunderstanding of the phenomenon.

Contextual Notes

There is an underlying assumption that participants share a common understanding of magnetic poles and field lines, but this is not explicitly stated. The discussion does not resolve the confusion surrounding the behavior of magnetic poles upon cutting a magnet.

endoparasite
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If the magnetic field lines are going from north to south pole then why when we cut a magnet from middle the two cutting edges become like poles. Common sense says that one edge should be north pole and other should be south . Can anyone explain ?
 
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The cut edges can't be like poles. That would mean that one of the new magnets would have to either be a monopole or instantly flip its polarity.
 
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All we can say is that "common sense" is right in this case. If you cut a bar magnet into two pieces, the two cut edges do NOT become like poles. The S and N poles of the original magnet become S and N poles of the new magnets, the cut ends become N and S poles. What made you think they became like poles?
 
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endoparasite said:
If the magnetic field lines are going from north to south pole then why when we cut a magnet from middle the two cutting edges become like poles. Common sense says that one edge should be north pole and other should be south . Can anyone explain ?

I cannot explain this any more than I can explain why the sun sets in the north, water is dry, or sound moves faster than light. It is literally the opposite of what happens.
 
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