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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2006

  • question_answer
    A magnetized wire of magnetic moment M and length L is bent in the form of a semicircle of radius r. The new magnetic moment is:

    A)  M                          

    B)         \[\frac{M}{2\pi }\]

    C)  \[\frac{M}{\pi }\]                           

    D)         \[\frac{2M}{\pi }\]

    E)  zero

    Correct Answer: D

    Solution :

    Length of semicircle\[\pi r=l\] where          \[r=\frac{l}{\pi }\] Distance between two poles in semicircle\[=2r\]. Magnetic moment\[M=m\times 2r=\frac{M}{l}\times \frac{2l}{\pi }=\frac{2M}{\pi }\]


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