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Mass spectrometer

  • Thread starter v_pino
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  • #1
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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
PV
 

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  • #2
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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?
 
  • #3
169
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thanks :)
 

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