if x stands for the magnetic susceptibility of a given material identify the class of materials for which (i) -1<x<0 (ii) 0<x<​​n(n stands for small positive number)
a) write the relative magnetic permeability of these materials.

i) -1<x<0 here, the magnetic susceptibility x is negative so the material is diamagnetic.
ii)  0<x<​​n here, the magnetic susceptibility x is positive but is small, so the substance is paramagnetic.
a) Relative magnetic permeability µr  = 1 + x 

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