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!

Variable separation capacitor

  1. Mar 13, 2012 #1
    Hi there,

    I'm trying to calculate the average capacitance of a "variable separation capacitor." Google (and all my textbooks) are not helping me at all.

    The capacitor has two parallel plates, one of which is hinged at one side. Sort of like this...


    Basically I need an expression for the capacitance in terms of the displacement between the sides opposite to the hinge. Could you help me find an expression for this?


    EDIT: After looking the derivation for a normal cap, its obvious that the new capacitance is a function of x (distance from the hinge to other side):

    C = εA/mx

    where m is the gradient of the one plate with respect to the other. However, is there a way to get average capacitance?
    Last edited: Mar 13, 2012
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted