1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

How much charge stored in capacitor ?

  1. Apr 24, 2009 #1
    A paper is placed between two plates of copper , area 100 cm^2. The thickness of the paper 0.005cm and its dielectric constant is 2.5 . If the paper can bear an electric field of 5 x 10^5 V/cm then calculate the maximum voltage upto which the capacitor can be charged.How much charge will be stored on the capacitor ?

    My attempt -> A=100cm^2
    5x10^5=9x10^9 x q / r
  2. jcsd
  3. Apr 24, 2009 #2


    User Avatar
    Homework Helper

    Welcome to PF.

    First figure the capacitance
    ε = 2.5*εo
    C = ε*A/d = 2.5*8.8*10-12*(.01 m2)/.00005m

    Then you can use that result to figure the charge at max V with

    Q = v*C
  4. Apr 25, 2009 #3
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook