1. Not finding help here? Sign up for a free 30min 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!

Parallel plate capacitor and insulating material

  1. May 22, 2009 #1
    1. The problem statement, all variables and given/known data

    A parallel-plate capacitor has plates of 10 cm^2 area separated by a 0.10mm layer of glass insulation with resistivity rho = 1.2x10^13 omega*m and dielectric constant k= 5.6. Because of the finite resistivity, current can leak through the insulation.

    How do I Show that it depends only on the properties of the insulating material and not on its dimensions?

    2. Relevant equations

    C= emf(A/d)


    3. The attempt at a solution
    I found the time constant for this capacitor to discharge through its insulation. T= 590s
     
  2. jcsd
  3. May 22, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    Consider the resistivity

    http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html#c2

    Consider too the equation you have for capacitance.

    Notice anything about how - when you combine the 2 - the RC has a tendancy not to be dependent on the cross sectional area?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Parallel plate capacitor and insulating material
Loading...