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

  • question_answer
    A closely wound solenoid of 1000 turns and area of cross-section \[1.4\times {{10}^{-4}}{{m}^{2}}\] carrying a current of 3A is suspended through its centre allowing it to turn in a horizontal plane. The magnetic moment associated with this solenoid is:

    A) \[0.22\,J\,{{T}^{-1}}\]             

    B)             \[0.32\,J\,{{T}^{-1}}\]

    C)             \[0.42\,J\,{{T}^{-1}}\]             

    D)             \[0.52\,J\,{{T}^{-1}}\]

    Correct Answer: C

    Solution :

    (c) \[0.42\,J\,{{T}^{-1}}\] Here, \[N=1000,\text{ }A=14\times {{10}^{-4}}{{m}^{2}},l=3A\] \[M=NlA=1000\times 3\times 14\times {{10}^{-4}}=0.42\text{ }J{{T}^{-1}}\]


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