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BCECE Engineering BCECE Engineering Solved Paper-2012

  • question_answer
    The magnetic moment produced in a substance of 1 g is\[6\times {{10}^{-7}}\,A-{{m}^{2}}.\] If its density is \[5g\,c{{m}^{-3}},\] then the intensity of magnetization in A/m will be

    A)  3.0                        

    B)         \[3\times {{10}^{-6}}\]

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

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

    Correct Answer: A

    Solution :

    Intensity of magnetisation, \[I=\frac{M}{V}=\frac{\text{M}}{\text{mass/density}}\] Given, \[=1g={{10}^{-3}}\,kg\] and density \[=5g/c{{m}^{3}}\] \[=\frac{5\times {{10}^{-3}}kg}{{{({{10}^{-2}})}^{3}}{{m}^{3}}}\] \[=5\times {{10}^{3}}kg/{{m}^{3}}\]                 Here,     \[I=\frac{6\times {{10}^{-7}}\times 5\times {{10}^{3}}}{{{10}^{-3}}}=3\,A/m\]    


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