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JEE Main & Advanced Physics Magnetism Question Bank Magnetic Materials

  • question_answer
    If the angular momentum of an electron is \[\overrightarrow{J\,}\] then the magnitude of the magnetic moment will be              [MP PET 2002]

    A)            \[\frac{eJ}{m}\]                  

    B)            \[\frac{eJ}{2m}\]

    C)            eJ 2m                                       

    D)            \[\frac{2m}{eJ}\]

    Correct Answer: B

    Solution :

               As we know for circulating electron magnetic moment \[M=\frac{1}{2}evr\]                                   ...... (i) and angular momentum \[J=mvr\]  ...... (ii) From equation (i) and (ii) \[M=\frac{eJ}{2m}\]


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