SSC JE Electrical Engineering 23 Jan 2018 Evening Paper

Eddy current loss (We) $={\mathit{K}}_{\mathit{e}}{\mathit{B}}_{\mathit{m}}^2{\mathit{f}}^2{\mathit{t}}^2\mathit{V}$ watt
${\mathit{K}}_{\mathit{e}}$ = constant of proportionality
${\mathit{B}}_{\mathit{m}}$ = Maximum flux density in wb/${\mathit{m}}^2$
f = frequency in Hz
t = thickness of the lamination in meter
v = volume of the armature case in ${\mathit{m}}^3$
So eddy current loss do not depend on susceptibity of material.