Q92 / 100 · BITSAT 2022 · Physics

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? Figure

  • A
    Both $X$ and $Y$ are suitable for making electromagnets.
  • B
    Both $X$ and $Y$ are suitable for making permanent magnet.
  • Correct answer
    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

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.

Hence, the correct answer is option: 'C'.

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