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Magnetism And Matter

Question
CBSEENPH12037749

Steel is preferred for making permanent magnets whereas soft iron is preferred for making electromagnets. Give one reason.   

Solution
Since, steel has a high factor of coercivity, it is preferred for making permanent magnets. 
Soft iron is used for making electromagnets because of its high permeability and also, hysteresis loop is narrow. Therefore, energy loss per volume per cycle will be small.