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B
soft iron core with 4% Si
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C
cobalt core
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D
ferrite core
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E
radiomental
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Solution
The correct option is E soft iron core with 4% Si In order to reduce the eddy current losses, most low-frequency power transformers and inductors use laminated cores, made of stacks of thin sheets of silicon steel. Material with high permeability and low coercivity is used to have a core with low hysteresis loss and low flux leakage. Silicon steel i.e. soft iron with 4% Si is the alloy having low coercivity and high magnetic permeability fit for the transformer core.