Discussion
If the transformer core is made of copper:
Answer: B
With a copper core, the Eddy current loss will be more.
At a given supply voltage and frequency the core flux is fixed by \(V = 4.44fN\Phi\). Eddy current loss is inversely proportional to the resistivity of the core material, and copper's resistivity is many times lower than that of silicon steel, so very large eddy currents would circulate.
Copper is not ferromagnetic, so it has no hysteresis loss to speak of, and the magnetizing current would be enormous. Copper loss in the windings would rise with that larger current, not fall, so 'Copper loss will be less' is wrong as well.
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