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Velocity selector

  1. Jan 29, 2005 #1
    Hi ppl,
    I'm having a little trouble determining the direction of the E field in a velocity selector question. I can easily find the direction of the magnetic B field and the direction it forces a particle in. Once I do this, I know that the E field must oppose the force of the B field. The problem I have is determining the direction of the E field for a proton or an electron ( what the difference is) and also how to assign the polarity of the plates of the E field again for a proton and an electron.

    Any help would be welcome, thanks, joe
     
  2. jcsd
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