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Question

For different substances, hysteresis (BH) curves are given as shown in figure. For making an electromagnet, which of the following is most suitable?






A
Both A and B
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B
Only B
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C
Only C
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D
Both B and C
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Solution

The correct option is B Only B
For making electromagnet, we need a material which has smaller magnitude of retentivity as well as coercivity.

The graph shown in option B satisfies both the requirements.

Hence, (B) is the correct answer.
Why this Question?
Note: The materials having lower value of retentivity as well as corecivity is best suited to make an electromagnet.

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