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Question

Soft iron is preferred over steel in making electromagnets because of permeability and retentivity.

A
high
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B
zero
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C
zero
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D
low
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Solution

The correct options are
A high
D low

The soft iron core is more preferred than steel in making electromagnets, because:
(1) It has high permeability, so that magnetization is large even for a small magnetizing field
(2) Low retentivity, so that material will not retain the magnetic properties


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