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Mass spectrometer

  1. Apr 10, 2008 #1
    I managed to do part a) of the question but got stuck on b). Why use F=(mv^2)/r for circular motion? And even if I use this equation, how do I find r, the radius?

    Thank you

    Attached Files:

  2. jcsd
  3. Apr 10, 2008 #2
    When the ions leaves the electric field, they are only affected by the magnetic field and will therefor move in a circle. Altough they will only finnish half of the circle before they hit the plate. So, if you have a semicircle, where can you find the radius of the circle?
  4. Apr 10, 2008 #3
    thanks :)
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