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  4. The materials suitable for making electromagnets should have

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Q. The materials suitable for making electromagnets should have

AIEEEAIEEE 2004Magnetism and Matter

Solution:

The materials suitable for making electromagnets should have-high retentivity and low coercivity. Coercivity is usually measured in oersted or ampere/meter units and is denoted HC. When the coercive field of a ferromagnet is large, the material is said to be a hard or permanent magnet.