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  4. Permanent magnet has properties retentivity and coercivity respectively :

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Q. Permanent magnet has properties retentivity and coercivity respectively :

UPSEEUPSEE 2006

Solution:

The materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields). As the material in this case is never put to cylic changes of magnetisation, hence hysteresis is immaterial.