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Homework Help: Finding work to move a point charge to the center of a thin ring.

  1. Oct 2, 2012 #1
    1. Find the work required to move a point charge from infinitely far away to the center of a thin ring.

    The point charge is q= 1nanocoulomb.
    The rings charge is Q= 2 nanoC.
    The ring has a radius r=2m.

    2. Relevant equations

    U= qV
    W= -U

    I think the first thing to consider is the field E created by the ring. I also know that this problem should be able to be solved with a single integral.

    I don't really know where to start.

    Thanks in advance
    Last edited: Oct 2, 2012
  2. jcsd
  3. Oct 3, 2012 #2


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    welcome to pf!

    hi zbou! welcome to pf! :smile:

    the work done for the whole will be the sum of the work done for each part :wink:
  4. Oct 3, 2012 #3
    How about calculating the potential in the center of the ring?
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