Which of the following figures best represents the variation of magnetic susceptibility $(\chi)$ with temperature for a diamagnetic substance?

  • A
    $A$ horizontal line parallel to the temperature axis.
  • B
    $A$ line passing through the origin with a positive slope.
  • C
    $A$ curve decreasing with temperature.
  • D
    $A$ curve increasing with temperature.

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Which of the following is the most suitable material for making a permanent magnet?

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Reason: At Curie point,a ferromagnetic substance starts behaving as a paramagnetic substance.

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