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Homework Help: Radial Electric Field

  1. Mar 13, 2012 #1
    1. The problem statement, all variables and given/known data

    Radial component of an electric field near charge 'q'.

    E = (1 / 4∏ε) * (q/r^2)

    Need to find the potential of this which is done through integrating this and taking the negative answer, i.e.

    ΔV = -∫E dr

    This is to be along a radial path towards the charge, starting from infinity to r2.

    3. The attempt at a solution

    So I have

    ΔV = - (q/4∏ε) ∫1/r^2 dr

    As the charge is constant.
    Just unsure on the limits, I'm guessing its ∞ and r2, would that be right?
  2. jcsd
  3. Mar 13, 2012 #2


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    Homework Helper

    [tex]\Delta V=V(r)-V(\infty)=-\frac{q}{4\pi \epsilon _0}\int_{\infty}^r{\frac{1}{r^2}dr}[/tex],

    with V(∞)=0

  4. Mar 13, 2012 #3
    Awesome, cheers mate. I had my limits the wrong way around.
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