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Q.

Is it true that pure iron cannot retain its magnetism for a long time and hence it cannot be used for making permanent magnet?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
Pure metal cannot retain its magnetic field for long periods, making it unsuitable for making a permanent magnet. In place of iron, Cobalt-steel or other metal alloys such as ALNICO can be used to make permanent magnets.
 
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