Theory of Diamagnetism
Langevin Theory of diamagnetism, proposed by Paul Langevin, provides a classical-based model to explain the diamagnetic behavior of materials. The theory is an approximation based on classical physics and yields results that are in good agreement with experimental observations.
Key concept in the Langevin theory is the behavior of the electrons in the material when subjected to an external magnetic field. The theory assumes that the material has classically bound electrons, and it considers the response of these bound electrons to the applied magnetic field.
Derivation of Langevin’s susceptibility, which quantifies the material’s response to the magnetic field, is based on the assumption of a classically bound electron. The susceptibility is expressed as:
χ = e2Zr2μ0/6mV
where,
- e is Charge of Electron
- Z is Number of Electrons Per Unit Volume
- r is Mean Radius of Electron’s Path
- μo is Permeability of Free Space
- m is Mass of Electron
- V is Volume over which Magnetic Field Acts
Expression for susceptibility provides insight into fundamental factors influencing the diamagnetic behavior of materials, particularly role of electron motion and material’s volume.
Diamagnetism
Diamagnetism is the property of materials that are repelled by a magnetic field. When an applied magnetic field creates an induced magnetic field in these materials in the opposite direction, it causes a repulsive force.
In this article, we will see What is Diamagnetism, Types of Magnetic Materials, Properties of Diamagnetic Materials, Examples of Diamagnetic Materials, Applications of Diamagnetic Materials, and others in detail.
Table of Content
- What is Diamagnetism ?
- Types of Magnetic Materials
- What are Diamagnetic Materials?
- Theory of Diamagnetism
- Properties of Diamagnetism
- Examples of Diamagnetism
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