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  4. Assertion: Soft iron is used as a core of transformer. Reason: Area of hysteresis loop for soft iron is small.

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Q. Assertion: Soft iron is used as a core of transformer. Reason: Area of hysteresis loop for soft iron is small.

VMMC MedicalVMMC Medical 2010

Solution:

Hysteresis loss in the core of transformer is directly proportional to the hysteresis loop area of the core material. Since soft iron has narrow hysteresis loop area, that is why soft iron core is used in the transformer.