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Q.

The material suitable for making electromagnets should have

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a

high retentivity and high coercivity 

b

low retentivity and low coercivity

c

high retentivity and low coercivity

d

low retentivity and high coercivity

answer is B.

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Detailed Solution

Electromagnets are made of soft iron which have low retentivity and low coercivity. 

so that the substance can be easily magnetised and demagnetised in both directions.

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