Discussion
When the relative permeability of a material is slightly less than 1 then it is called :
Answer: A
Such a material is called a diamagnetic material.
In a diamagnetic material the induced magnetisation opposes the applied field, so the magnetic susceptibility is small and negative and the relative permeability is slightly less than 1. Bismuth, copper, silver and water are examples.
Paramagnetic materials have a relative permeability slightly greater than 1, and ferromagnetic and ferrimagnetic materials have relative permeabilities far greater than 1, so none of them fits.
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