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- Help me understand! The materials suitable for making electromagnets should have
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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