2. Solved Papers
  3. BCECE Medical

BCECE Medical BCECE Medical Solved Papers-2003

  • question_answer
    A bar of magnetic moment M is cut into two parts 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 \[2\,l\] and m, then Magnetic moment \[M=m\times 2\,l\] ... (i) If the magnetic moment of either part be M, then \[M=m\,l\] ... (ii) Dividing Eq. (ii) by Eq. (i), we have \[\frac{M}{M}=\frac{ml}{2\,ml}=\frac{1}{2}\] \[\therefore \] \[M=\frac{M}{2}\]


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