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MGIMS WARDHA MGIMS WARDHA Solved Paper-2003

  • question_answer
    An electron is moving with velocity \[\upsilon \] on a circular path of radius r in a transverse electric field B. The specific charge (elm) of the electron is:

    A) \[B\upsilon r\]                                  

    B) \[\frac{\upsilon }{Br}\]

    C) \[B\upsilon {{r}^{2}}\]                                   

    D) \[\frac{B}{r\upsilon }\]

    Correct Answer: B

    Solution :

    If a magnetic field  is  applied perpendicular to a moving electron, then electron will move on a circular path. Therefore, centripetal force = force on electron due to magnetic field  \[\frac{m{{\upsilon }^{2}}}{r}=Be\upsilon \]\[\frac{e}{m}=\frac{\upsilon }{rB}\]


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