Magnetic Bar Question: Freezing to Zero Kelvin

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Discussion Overview

The discussion revolves around the behavior of magnetic bars at extremely low temperatures, specifically addressing the implications of cooling a magnetic bar to near absolute zero and its effects on the magnetic field. The scope includes theoretical considerations and conceptual clarifications regarding magnetism and temperature effects.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether a magnetic bar retains its magnetic field at zero Kelvin.
  • Another participant asserts that reaching absolute zero is impossible, suggesting that the original question may be irrelevant.
  • A participant acknowledges the impossibility of reaching absolute zero but inquires about the behavior of the magnetic field at temperatures close to zero Kelvin, asking if it increases or decreases.
  • A later reply proposes that understanding how to destroy the magnetic strength of a permanent magnet could provide insight into the effects of low temperatures on magnetic fields, hinting at a relationship between temperature changes and magnetic properties.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the effects of low temperatures on the magnetic field of a magnetic bar, and multiple competing views remain regarding the relevance and implications of the original question.

Contextual Notes

Limitations include the assumption that absolute zero cannot be reached and the dependence on definitions of magnetic properties at low temperatures, which remain unresolved.

pixel01
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I have a question about magnetic bars. If we froze a magnetic bar down to zero Kelvin, does it still have a magnetic field?
 
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Without wishing to sound rude, we cannot reach absolute zero [in a finite number of processes], so your question is moot. And as an aside the magnetic would not 'freeze'.
 
OK, we can not reach absolute zero, but we can reach as low as several K. So what does the magnetic field change when the m-bar is freezed to that low temperature? Will it increase or decrease?
 
pixel01 said:
OK, we can not reach absolute zero, but we can reach as low as several K. So what does the magnetic field change when the m-bar is freezed to that low temperature? Will it increase or decrease?

Maybe you should consider this. How would one destroy the magnetic strength of a permanent magnet? Does one chill down to low temperatures, or does one heat it up? If you can answer this question (which, I think, is something that is covered in elementary science classes), then you have a clue in the answer to your question.

Zz.
 

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