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Question: Answered & Verified by Expert
If the $B-H$ curves of two samples of $X$ and $Y$ of iron are as shown below, then which one of the following statement is correct?

PhysicsMagnetic Properties of MatterBITSATBITSAT 2022
Options:
  • A
    Both $X$ and $Y$ are suitable for making electromagnets.
  • B
    Both $X$ and $Y$ are suitable for making permanent magnet.
  • C
    $X$ is suitable for making permanent magnet and $Y$ for making electromagnet.
  • D
    $X$ is suitable for making electromagnet and $Y$ is suitable for permanent magnet.
Solution:
2719 Upvotes Verified Answer
The correct answer is:
$X$ is suitable for making permanent magnet and $Y$ for making electromagnet.
For permanent magnet we prefer a material with high retentivity and high coercivity. For electromagnet, we prefer high saturated magnetism, low coercivity and least possible area of hystersis loop. Therefore, $X$ is suitable for making permanent magnet and $Y$ for making electromagnet.

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