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BCECE Engineering BCECE Engineering Solved Paper-2009

  • question_answer
    A wire often the \[l\] carrying a current \[I\] A is bent into a circle. The magnitude of the magnetic moment is

    A) \[\frac{l{{I}^{2}}}{2\pi }\]                                             

    B) \[\frac{l{{I}^{2}}}{4\pi }\]

    C) \[\frac{{{l}^{2}}I}{2\pi }\]                             

    D)        \[\frac{{{l}^{2}}I}{4\pi }\]

    Correct Answer: D

    Solution :

    If the radius of circle is r, then \[2\pi r=l\]                 Area \[=\pi {{r}^{2}}=\frac{{{l}^{2}}}{4\pi }\] Magnetic moment\[=IA=\frac{I{{l}^{2}}}{4\pi }\]


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