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11th Class Physics Physical World / भौतिक जगत Question Bank 11th CBSE Physics Mathematical Tools, Units & Dimensions

  • question_answer
    Why is Fe3O4 ferrimagnetic at room temperature but becomes conductor at 850 K?

    Answer:

    Fe3O4 is ferrimagnetic at room temperature because in its crystals magnetic numbers of Fe (II) and Fe (III) ions are unequal in magnitude and aligned in antiparallel direction. But when heated at 850 K the arrangement randomized and substance becomes paramagnetic.  


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