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Why ignore the magnetic field?

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  1. Apr 22, 2014 #1
    1. The problem statement, all variables and given/known data

    Consider a simple mass spectrometer. The magnitude of the electric field between the plates of the velocity selector is 2 500 V/m and the magnetic field in both the velocity selector and the deflection chamber has a magnitude of 0.035 T. Calculate the radius of the path for a singly charged ion with mass m=2.18E-26.




    2. Relevant equations


    qE=1/2 mv^2

    F = qVxB

    3. The attempt at a solution

    Solution attached.

    Why is the magnetic field ignored for the velocity selector portion??
     

    Attached Files:

  2. jcsd
  3. Apr 22, 2014 #2

    rock.freak667

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    Homework Helper

    I don't understand what you mean by ignored as the field strength is used in both calculations.
     
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