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Homework Help: Graphing e field for ring charge

  1. Aug 31, 2011 #1
    1. The problem statement, all variables and given/known data
    E=(kqz)/(z^2+a^2)^1.5 Through calculus i found that the max occurs at z=a/sqrt(2) and z=-a/sqrt(2) and I think the negative one is the minimum. That answer was given in the book also. The ring has radius a. It wants me to graph E versus z. I'm a little confused on how to graph this. the only 2 points I have on there are 1 max and 1 min but I don't know how to draw the general shape.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Sep 1, 2011 #2


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    Homework Helper

    There are two points you know: the places of maximum and minimum. What is E at z=0? What is the sign of E at negative values of z? Where is E=0? What are the limits at infinity and at -infinity? From these, you can sketch the curve.

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