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Q.

Core of electromagnets are made of ferromagnetic material which has

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a

high permeability and low retentivity

b

 high permeability and high retentivity
 

c

low permeability and high retentivity 

d

 low permeability and low retentivity
 

answer is A.

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Detailed Solution

Due to high permeability and low retentivity ferromagnetic materials are best suitable for temporary magnets.

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