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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
        The magnetic moment produced in a substance of 1 g is\[6\times {{10}^{-7}}A{{m}^{2}}\]. If its density is \[5g/c{{m}^{2}},\] then the intensity of magnetisation in A/m will be

    A)  \[8.3\times {{10}^{6}}\]               

    B)  3.0

    C)  \[1.2\times {{10}^{-7}}\]             

    D)  \[3\times {{10}^{-6}}\]

    Correct Answer: B

    Solution :

                    \[I=\frac{M}{V}=\frac{M}{mass/density}\] Density \[=\frac{5\times {{10}^{-3}}}{{{({{10}^{-2}})}^{3}}}=5\times {{10}^{3}}kg/{{m}^{3}}\]                 \[I=\frac{6\times {{10}^{-7}}\times 5\times {{10}^{3}}}{{{10}^{-3}}}\]                 \[=3A/m\]


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