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!

Electron repulsion per unit volume

  1. Oct 7, 2009 #1


    User Avatar
    Gold Member

    Hi, im trying to calculate how many electrons I need to confine in one cubic centimeter to make the pressure on the "walls" 1psi. i've tried the equation for the repulsion of two charges, but we're talking about trillions of electrons here and they're all pushing on each other however slightly. Yes, the force exerted on the electrons toward the center of the cube will have neutral net repulsion but its the ones on the edge that stump my calculations.
    Could anyone help me out here or suggest a reference?

    Thanks in advance-

  2. jcsd
  3. Oct 7, 2009 #2

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    You can calculate the energy of a sphere (that's probably the easiest shape to start with) of radius R and total charge Q, and then look at dE/dr.
  4. Oct 7, 2009 #3
    Sorry, the wrong topic
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook