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Solution


Q.

The core of electromagnet is made of:
1 soft iron  
2 steel  
3 magnesium  
4 copper  

Ans.

(1)

The core of electromagnet is made of soft iron due to following reasons:
(i) It can be easily magnetised and demagnetised.
(ii) It has low carbon content.
(iii) It has large susceptibility and small retentivity.
(iv) It does not retain its magnetism when the current is switched off.
(v) It is less corrosive.