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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Cathode Rays and Positive Rays

  • question_answer
    An electron beam is moving between two parallel plates having electric field \[1.125\times {{10}^{-6}}N/m\]. A magnetic field \[3\times {{10}^{-10}}T\] is also applied so that beam of electrons do not deflect. The velocity of the electron is                                         [MH CHT 2004]

    A)            \[4225\ m/s\]                      

    B)            \[3750\ m/s\]

    C)            \[2750\ m/s\]                      

    D)            \[3200\ m/s\]

    Correct Answer: B

    Solution :

               \[v=\frac{E}{B}=\frac{1.125\times {{10}^{-6}}}{3\times {{10}^{-10}}}=3750\,m/s\]


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