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AIIMS AIIMS Solved Paper-2007

  • question_answer
    The figure shows three situations when an electron with velocity \[{{\left( \frac{1}{2} \right)}^{2}}\]travels through a uniform magnetic field \[\frac{1}{4\lambda }\]. In each case, what is the direction of magnetic force on the electron?                                      

    A)  +ve z-axis, -ve x-axis, +ve y-axis

    B)  -ve z-axis, -ve x-axis and zero

    C)  +ve z-axis, +vey-axis and zero

    D)  -ve z-axis, +ve x-axis and zero

    Correct Answer: B

    Solution :

    According to Flemings left hand rule, in figures (1) and (2) magnetic force on the electron will be directed in -ve z-axis and -ve x-axis respectively. In figure (3) velocity of electron and direction of magnetic field are antiparallel, so no force will act on electron.


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