Question

soft iron piece use to store bar magnet
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Answer 1

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A magnet keeper, also known historically as an armature, is a bar made from magnetically soft iron or steel, which is placed across the poles of a permanent magnet to help preserve the strength of the magnet by completing the magnetic circuit; it is important for magnets that have low magnetic coercivity,

Answer 2

Explanation:

because if it would be hard iron then the iron will change into magnet