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Q.

Transformers for use at power or audio frequencies typically have cores made of:

 A.

iron

 B.

silicon steel

 C.

ferrite

 D.

cobalt

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Solution:
Option(B) is correct

Transformers for use at power or audio frequencies typically have cores made of high permeability silicon steel.

The steel has a permeability many times that of free space and the core thus serves to greatly reduce the magnetizing current and confine the flux to a path which closely couples the windings


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