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Which of these source charges will produce a maximum possible speed?

  1. Jul 31, 2009 #1
    1. The problem statement, all variables and given/known data

    Your lab assignment is to use positive charge Q to launch a proton, starting from rest, so that it acquires the maximum possible speed. You can launch the proton from the surface of a sphere of positive charge Q and radius R, or from the center of a ring of charge Q and radius R, or from the center of a disk of charge Q and radius R.

    a) We will choose to launch the proton from the surface of a sphere of positive charge Q and radius R.

    b) We will choose to launch the proton from the center of a ring of charge Q and radius R.

    c) We will choose to launch the proton from the center of a disk of charge Q and radius R.


    2. The attempt at a solution

    I have no idea how to go about solving this. I'm assuming a) is the correct answer because it has the greatest surface area?
     
  2. jcsd
  3. Jul 31, 2009 #2

    tiny-tim

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    Hi MyNewPony! :wink:

    Find the potential energy in each case (calculated with energy at infinity = 0) :smile:
     
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