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12th Class Physics Magnetism Question Bank MCQ - Magnetism and Matter

  • question_answer
    A permanent magnet in the shape of a thin cylinder of length 50 cm has intensity of magnetization \[{{10}^{6}}A{{m}^{-1}}\]. The magnetisation current is:

    A) \[5\times {{10}^{5}}A\]                

    B)             \[6\times {{10}^{5}}A\]

    C)             \[5\times {{10}^{4}}A\]                       

    D)             \[6\times {{10}^{4}}A\]

    Correct Answer: A

    Solution :

    (a) \[5\times {{10}^{5}}A\] Here,     \[l=50\,cm=0.5\,m,M={{10}^{6}}A{{m}^{-1}}\] As         \[M=\frac{magnetisation\,\,current({{l}_{m}})}{l(length)}\] Then,    \[{{l}_{M}}=M\times l\]             \[={{10}^{6}}\times 0.5=5\times {{10}^{5}}A\]


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