On which of the following parameters the eddy current loss occurring in a material does not depend?

• A. Magnetic flux Density
• B. The volume of the material
• C. The frequency of variation of flux
• D. Susceptibility

Answer: (D)

Eddy current loss: In transformer we provide alternating current in primary which produces alternating flux in core ,this flux links with secondary of transformer and induces emf in secondary, it may be possible that flux also links with some other conducting parts of transformer such as  ferromagnetic core or iron body and induces local emf in these parts of transformer which will cause a circulating current to flow in these parts causing heat loss. these currents are called eddy current and this loss is called eddy current loss.
Eddy current losses in the transformer are given by
Eddy current losses = Ke × Bm2 × f2 × V ×t2
Where Ke = Eddy current constant  t = thickness of the core V = Volume of material  Bm = Maximum flux density f = frequency 
Hence from the above expression, it is clear that the eddy current losses do not depend on the susceptibility of the material.