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

  • question_answer
    A solenoid of cross-sectional area \[2\times {{10}^{-4}}{{m}^{2}}\] and 900 turns has \[0.6\text{ }A{{m}^{2}}\] magnetic moment. Then the current flowing through it is:

    A) 2.24 A                          

    B)             2.34 mA

    C)             3.33 A                          

    D)             3.33 mA

    Correct Answer: C

    Solution :

    (c) 3.33 A Here,       \[N=900\text{ }turns,\] \[A=2\times {{10}^{-4}}{{m}^{2}},{{M}_{s}}=0.6\,A{{m}^{2}}\] The magnetic moment of solenoid, \[{{M}_{s}}=NlA\] The current flowing through the solenoid is \[l=\frac{{{M}_{s}}}{NA}=\frac{0.6}{900\times 2\times {{10}^{-4}}}=3.33\,A\]


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