2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Photo Electric Effect, X- Rays & Matter Waves

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

  • question_answer
    In Bainbridge mass spectrograph a potential difference of 1000 V is applied between two plates distant 1 cm apart and magnetic field in B = 1T. The velocity of undeflected positive ions in m/s from the velocity selector is  [RPMT 1998]

    A)            \[{{10}^{7}}m/s\]               

    B)            \[{{10}^{4}}m/s\]               

    C)            \[{{10}^{5}}m/s\]               

    D)            \[{{10}^{2}}m/s\]

    Correct Answer: C

    Solution :

                       \[v=\frac{E}{B}\]; where \[E=\frac{V}{d}=\frac{1000}{1\times {{10}^{-2}}}={{10}^{5}}\,V/m\]             Þ \[v=\frac{{{10}^{5}}}{1}={{10}^{5}}m/s\].


You need to login to perform this action.
You will be redirected in 3 sec spinner