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Electromagnets

What type of ...

Question

What type of magnetic material is used in making electromagnets and why?

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Solution

Core of electromagnets are made up of FERROMAGNETIC material which have high permeability and low retentivity.
SOFT IRON is a suitable material for electromagnets.
On placing a soft iron rod in solenoid and on passing a current,we increase the magnetism of the solenoid a thousand fold.
When we switch off the solenoid current,the magnetism is effectively switched off since the soft iron core has a low retentivity.
We can see the arrangement in the figure.

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