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Q.

Is it true that an electromagnet's core can be made of any metal?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
An electromagnet made up of a coil wrapped on a core which produces a magnetic effect. The core should be made of metal that allows more current through it so that it creates a necessary magnetic effect and also has higher magnetic permeability. Hence, soft iron can be used as a core for making an electromagnet.
The corrected statement would be, an electromagnet's core can be made of soft iron.
 
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