Discussion
If a transformer core is made of copper and coils are made up of steel wire, then:
Answer: B
The result is that Copper loss in the winding will be more.
Steel has a much higher resistivity than copper, so windings of steel wire would have much higher resistance and the \(I^{2}R\) loss in them would be larger for the same current.
The other statements are false. A copper core is non-magnetic, so the magnetizing current would rise enormously, not fall. Copper is a much better conductor than silicon steel, so eddy current loss in the core would increase. With those two wrong, 'All of the above' is wrong too.
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