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(C) The heating of a transformer is primarily caused by energy losses occurring within the device. These losses include:$1$. $I^2R$ loss (Copper loss)

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Both the hysteresis loss and heating effect of current

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(C) The heating of a transformer is primarily caused by energy losses occurring within the device. These losses include:$1$. $I^2R$ loss (Copper loss): This is the heating effect of current flowing through the primary and secondary windings.$2$. Hysteresis loss: This occurs due to the repeated magnetization and demagnetization of the transformer core as the alternating current flows.$3$. Eddy current loss: This is caused by induced currents circulating within the core material.Since both the heating effect of current ($I^2R$ loss) and magnetic losses (hysteresis and eddy currents) contribute to the rise in temperature,the correct answer is $C$.

Large transformers,when used for some time,become hot and are cooled by circulating oil. The heating of a transformer is due to:

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