Question

What is perfect diamagnetism?

Answer 1

1. Diamagnetism is a magnetism characteristic of materials that magnetize in the opposite direction of the magnetic field.
2. A perfect diamagnetic material produces a strong repulsion to the external magnets.
3. At low temperature, perfect dimagnetism is shown by certain materials.
4. The susceptibility $\left(\mathrm{\chi }\right)$ of a perfect diamagnetic material is $\mathrm{\chi }=-1$
5. Perfect diamagnetism happens due to complete absence of magnetic permeability and exclusion of interior magnetic field.
6. Superconducting materials obey perfect diamagnetic screening and can be considered perfect diamagnets as they tend to expel all magnetic fields.