Diamagnetism confusion -- Does diamagnetism really have to do with Lenz’s law?

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Homework Help Overview

The discussion revolves around the concept of diamagnetism and its relationship with Lenz's law, particularly in the context of how materials respond to magnetic fields. Participants explore the nature of diamagnetic materials and the underlying principles that govern their behavior in magnetic environments.

Discussion Character

  • Conceptual clarification, Assumption checking, Mixed

Approaches and Questions Raised

  • Participants question the textbook explanation linking Lenz's law to diamagnetism, noting that Lenz's law pertains to changing magnetic fields while diamagnetism is described as a quantum phenomenon. There is also a discussion about the conditions under which diamagnetic materials respond to magnetic fields, including the speed of approach of the magnet and the duration of exposure.

Discussion Status

The discussion is active, with participants providing differing viewpoints on the relationship between Lenz's law and diamagnetism. Some participants suggest that the classical explanations may not fully capture the quantum nature of the phenomenon. There is an acknowledgment of the need for a qualitative understanding of diamagnetism, especially for those who have not yet studied quantum mechanics.

Contextual Notes

There is a mention of potential confusion regarding the terminology used to describe the behavior of diamagnetic materials, specifically the distinction between attraction and repulsion. Additionally, the discussion highlights the challenge of reconciling classical models with quantum phenomena.

yymm
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Homework Statement
Does diamagnetism really got to do with Lenz’s law?
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In my textbook, and on many websites it says that when placed in a magnetic field and then due to Lenz’s law a magnetic dipole moment is created in atoms and so the material gets attracted to the magnet? But then in the case I bring the magnet close to the material very slowly( so the change in magnetic flux is very low), or I put the magnet there for a long time, stationary, then does that mean the material no longer gets magnetised?
 
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What kind of material? The diamagnetic materials are not attracted.
 
The answer is that Lenz's law has nothing to do with diamagnetism which is a quantum phenomenon. Lenz's law involves changing magnetic fields. However, all atoms exhibit diamagnetism and do so in steady magnetic fields. The effect has to do with electron orbits excluding magnetic flux. I think your textbook explanation is an attempt to explain diamagnetism as induced eddy currents at the atomic level. As is usual with classical models applied to quantum phenomena, the model falls short.

This Wikipedia article has more information.
 
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nasu said:
What kind of material? The diamagnetic materials are not attracted.
sorry I was meant to say repel instead of attract. Thanks for picking it up!
 
kuruman said:
The answer is that Lenz's law has nothing to do with diamagnetism which is a quantum phenomenon. Lenz's law involves changing magnetic fields. However, all atoms exhibit diamagnetism and do so in steady magnetic fields. The effect has to do with electron orbits excluding magnetic flux. I think your textbook explanation is an attempt to explain diamagnetism as induced eddy currents at the atomic level. As is usual with classical models applied to quantum phenomena, the model falls short.

This Wikipedia article has more information.
Yeah probably. If I haven't studied quantum mechanics yet then is it enough to know that diamagnetic materials gets repelled?
 
yymm said:
##\dots~## yet then is it enough to know that diamagnetic materials gets repelled?
Enough for what? If you have not studied quantum mechanics but you are worried what will be on the next test, it is probably "enough" to know qualitatively the distinguishing features of diamagnetism, paramagnetism and ferromagnetism.
 

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