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Question

Steel is used for making permanent magnet because :

A
energy loss is minimum
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B
density of steel is more
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C
residual magnetism of steel is more
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D
due to external magnetic field the magnetism does not destroy easily
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Solution

The correct option is D due to external magnetic field the magnetism does not destroy easily
Steel is used for making permanent magnet because its magnetism does not destroy easily by external magnetic field.

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