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I need help calculating the number of Electrons? (Current/Electron Density/Velocity)

  1. Oct 2, 2012 #1
    1. The problem statement, all variables and given/known data


    How many protons are in the beam traveling at the speed of light in the Tevatron at Fermilab, which is carrying 11.17 mA of current around the 6.3-km circumference of the main Tevatron ring?
    2. Relevant equations

    Not sure...



    3. The attempt at a solution

    I don't know how to calculate the the protons (electrons). I tried multiple different things but al the equations I have use the Cross Sectional area value (A) which can't be found from the given information.

    I tried manipulating such equations as

    current density = (number of electrons)(e)(drift velocity)

    and other similar equations but the all contain some form of the value of A?

    Please help :(
     
  2. jcsd
  3. Oct 2, 2012 #2
    Re: I need help calculating the number of Electrons? (Current/Electron Density/Veloci

    What is current?
     
  4. Oct 2, 2012 #3
    Re: I need help calculating the number of Electrons? (Current/Electron Density/Veloci

    and how do you find J {current density} from I {current} and a circumference?
     
  5. Oct 2, 2012 #4
    Re: I need help calculating the number of Electrons? (Current/Electron Density/Veloci

    What is the significance of current density here?
     
  6. Oct 2, 2012 #5
    Re: I need help calculating the number of Electrons? (Current/Electron Density/Veloci

    Ok got it! Thank You!!
     
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