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The materials suitable for making electromagnets should have.

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The materials suitable for making electromagnets should have
(a) high retentivity and high coercivity
(b) low retentivity and low coercivity
(c) high retentivity and low coercivity
(d) low retentivity and high coercivity

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(b)  Materials of low retentivity and low coercivity are suitable for making electromagnets.

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