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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

Jharkhand CECEJharkhand CECE 2007Magnetism and Matter

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 cyclic changes of magnetisation, hence hysteresis is immaterial.