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Q.

Which of the following material is used to make the core of an electromagnet?


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a

Aluminium

b

Soft iron

c

Wooden block

d

None of the above 

answer is B.

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Detailed Solution

A material used to make the core of an electromagnet is soft iron.
The core of an electromagnet is made of soft iron, an iron alloy. This nearly pure iron is preferred because, unlike most steels, it does not remain magnetised after the current is stopped. However, this material also can be magnetised easily, increasing the electromagnet's force.
 
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