2. Solved Papers
  3. WB JEE Medical

WB JEE Medical WB JEE Medical Solved Paper-2013

  • question_answer
    A bar magnet of length \[l\] and magnetic dipole moment M is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

    A)  M

    B)  \[\frac{3}{\pi }M\]

    C)  \[\frac{2}{\pi }M\]

    D)  \[\frac{M}{2}\]

    Correct Answer: B

    Solution :

     The magnetic moment,\[~M=ml\] From figure       \[I=\frac{\pi }{3}\times r\] or \[r=\frac{3l}{\pi }\] \[\therefore \] New magnetic moment \[M=m\times r\] \[=m\times \frac{3l}{\pi }=\frac{3}{\pi }.ml=\frac{3M}{\pi }\]


You need to login to perform this action.
You will be redirected in 3 sec spinner