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Homework Help: Electric Potential Cone

  1. Sep 9, 2010 #1
    1. The problem statement, all variables and given/known data

    I am basically given a cone with uniform volume charge and told to find the area of highest electric potential.

    2. Relevant equations

    I want to use the equation: V= q/4piEr

    3. The attempt at a solution

    I am having trouble finding anything in my book. I am comparing this in my mind to a sphere and wondering if it would be prudent to find the center of mass of the cone and place a point as close to that as possible. I am just unsure if a cone of uniform volume charge is similar to a sphere of uniform volume charge in that it acts like a point charge outside of the volume. I can't seem to find any information on this.
  2. jcsd
  3. Sep 10, 2010 #2
    You'll want to use dV= dq/(4*pi*E_0*r) so that you can get the potential. Max and mins occur at turning points, when the derivative (or gradient in this case) is zero.
  4. Sep 11, 2010 #3
    Ah. That makes a lot of sense. Thank you!
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