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JEE Main & Advanced JEE Main Paper (Held On 12-Jan-2019 Evening)

  • question_answer
    A paramagnetic material has\[{{10}^{28}}\,\,atoms/{{m}^{3}}\]. Its magnetic susceptibility at temperature 350 K is \[2.8\times {{10}^{-4}}.\] Its susceptibility at 300 K is [JEE Main Online Paper Held On 12-Jan-2019 Evening]

    A) \[3.267\times {{10}^{-4}}\]                              

    B) \[3.672\times {{10}^{-4}}\]

    C) \[2.672\times {{10}^{-4}}\]                  

    D)   \[3.726\times {{10}^{-4}}\]

    Correct Answer: A

    Solution :

    For a paramagnetic material, \[\chi \propto \frac{1}{T}\] \[\Rightarrow \]\[{{\chi }_{2}}={{\chi }_{1}}\frac{{{T}_{1}}}{{{T}_{2}}}=2.8\times {{10}^{-4}}\times \frac{350}{300}=3.267\times {{10}^{-4}}\]


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