The materials suitable for making electromagnets should have

  • Option 1)

    high retentivity and high coercivity

  • Option 2)

    low retentivity and low coercivity

  • Option 3)

    high retentivity and low coercivity

  • Option 4)

    low retentivity and high coercivity.

 

Answers (1)

As we learnt in

Coercivity (H) -

When H = Hc , B = 0

- wherein

i.e  Magnetising fields (H) required to destroy the residual magnetism.

 

 

Retentivity -

When H=0 (after having increases from 0 to Hs), B=Br

Br - residual magnetism, retentivity

-

 

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


Option 1)

high retentivity and high coercivity

Incorrect

Option 2)

low retentivity and low coercivity

Correct

Option 3)

high retentivity and low coercivity

Incorrect

Option 4)

low retentivity and high coercivity.

Incorrect

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