Out of the two magnetic materials, 'A' has relative permeability slightly greater than unity while 'B' has less than unity. Identify the nature of the materials 'A' and 'B'. Will their susceptibilities be positive or negative ?

Explanation

The material A, whose relative permeability is slightly greater than one, is a paramagnetic material. Its susceptibility is positive.
The material B, whose relative permeability is slightly less than unity, is a diamagnetic material. Its susceptibility is negative.