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J & K CET Medical J & K - CET Medical Solved Paper-2011

  • question_answer
    A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A. The magnetic moment of the coil is, approximately

    A)                  5 Am2

    B)                  10 Am2

    C)                  20 Am2                               

    D)  40 Am2

    Correct Answer: A

    Solution :

                     Magnetic moment, \[M=niA\] \[M=100\times 3.2\times (\pi r_{1}^{2})\]                 \[=100\times 3.2\times \frac{22}{7}\times \frac{10}{100}\times \frac{10}{100}\] \[=10.048\text{ }A-{{m}^{2}}\]


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