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

  • question_answer
    A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength \[20\ V{{m}^{-1}}\]and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons [CBSE PMT 1996]

    A)            20 \[m{{s}^{-1}}\]              

    B)            40 \[m{{s}^{-1}}\]

    C)            8 \[m{{s}^{-1}}\]                 

    D)            5.5 \[m{{s}^{-1}}\]

    Correct Answer: B

    Solution :

               \[v=\frac{E}{B}=\frac{20}{0.5}=40\,m/\sec .\]


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