# Magnetic Bar Question: Freezing to Zero Kelvin

• pixel01
In summary, the question is whether a magnetic bar would still have a magnetic field if it were frozen to absolute zero. The answer is that it is not possible to reach absolute zero, and even if it were, the magnetic field would not "freeze". However, if the bar were cooled to several Kelvin, the magnetic field may decrease but it is not possible to completely destroy the magnetic strength of a permanent magnet by cooling it. Heating it up may be a more effective way to weaken its magnetic field.
pixel01
I have a question about magnetic bars. If we froze a magnetic bar down to zero Kelvin, does it still have a magnetic field?

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.

## 1. What is the significance of freezing to zero Kelvin in the magnetic bar question?

Freezing to zero Kelvin, also known as absolute zero, is significant because it is the lowest possible temperature that can be achieved. At this temperature, all molecular motion ceases and the particles of a substance are in their lowest energy state. This provides insight into the fundamental behavior of matter and is a key concept in thermodynamics and quantum mechanics.

## 2. How does the magnetic bar question relate to the concept of absolute zero?

The magnetic bar question explores the behavior of a magnetic bar as it is cooled to absolute zero. At this temperature, the particles of the magnetic bar are in their lowest energy state, resulting in a complete absence of magnetic field. This helps illustrate the effects of temperature on magnetic properties and can be used to study the behavior of other materials at extremely low temperatures.

## 3. Can any substance actually reach absolute zero?

No, it is impossible to reach absolute zero in practice. As we approach this temperature, the energy required to lower the temperature becomes infinitely large, making it physically impossible to reach. Additionally, quantum mechanical effects prevent particles from being in a completely motionless state.

## 4. What are some real-world applications of the magnetic bar question and absolute zero?

The study of absolute zero and its effects on materials is important in fields such as cryogenics, superconductivity, and quantum computing. It also has practical applications in the development of more efficient refrigeration and cooling systems.

## 5. Are there any known substances that exhibit superconductivity at absolute zero?

Yes, some materials such as certain metals, alloys, and ceramics have been found to exhibit superconductivity at absolute zero or very close to it. These materials have potential applications in areas such as energy transmission and magnetic levitation.

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