1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electric field in a spherical capacitor.

  1. Mar 16, 2015 #1
    1. The problem statement, all variables and given/known data

    The potential difference Δϕ between the plates of a spherical capacitor is kept constant. Show that then the electric field at the surface of the inner sphere will be a minimum if a=(1/2)b, find that minimum.
    Where: a=radius of the inner sphere, b=radius of the outside sphere.

    2. Relevant equations
    The potential difference between the plates is [tex]Δϕ=(Q/4πϵ_0)(1/b-1/a)[/tex]
    Last edited: Mar 16, 2015
  2. jcsd
  3. Mar 16, 2015 #2


    User Avatar
    Science Advisor
    Homework Helper
    2017 Award

    Hi Fel, welcome to PF :smile: !

    There is something special about the PF homework part you need to know: the guidelines require you present an attempt at solution !

    So no point in erasing part 3 of the template: we can't help until you show an effort!

    3. The attempt at a solution
    For a start, you might bring in an eqation for the electric field at the surface of the inner sphere, expressed in a and ##\Delta \phi##.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted