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BCECE Engineering BCECE Engineering Solved Paper-2003

  • question_answer
    A bar of magnetic moment M is cut into two pans of equal length. The magnetic moment of either part is;

    A)  \[M\]                                  

    B)         \[2M\]

    C)         \[\frac{M}{2}\]                                

    D)         zero

    Correct Answer: C

    Solution :

    Let effective length and pole strength of a bar magnet is \[2l\] and \[m,\]then Magnetic moment                                 \[M=m\times 2l\]                            ?(i) If the magnetic moment of either part be M, then                                 \[M=ml\]                             ?(ii) Dividing Eq. (ii) by Eq. (i), we have                                 \[\frac{M}{M}=\frac{ml}{2ml}=\frac{1}{2}\]                         \[\therefore \]  \[M=\frac{M}{2}\]


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