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!

Help on Circuit HW problem

  1. Nov 20, 2006 #1
    A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates.

    Part A:
    A voltmeter reads 46.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 15.0 V. What is the dielectric constant of this material?

    Part B:
    What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?

    I know how to do part A using K = Vo/V, But i do not know how to work the problem if it involve partial dielectric.Any helps or hints would be great thanks.
  2. jcsd
  3. Nov 20, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    Think of the system as two separate capacitors. Are they arranged is series or in parallel?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Help on Circuit HW problem
  1. Help With HW problem. (Replies: 11)