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Q.

The material suitable for making electro-magnets should have

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a

high retentivity and low coercivity

b

low retentivity and high coercivity

c

low retentivity and low coercivity

d

high retentivity and high coercivity

answer is B.

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Detailed Solution

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The material suitable for making electro-magnets should have low retentivity and low coercivity so that it would be easier to magnetize and demagnetize them. 

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