Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electric flux

  1. Feb 1, 2007 #1
    1. The problem statement, all variables and given/known data
    A cube has a charge Q at its center and has 6 charges q placed symetrically around the central charge. Each one is placed the same distance from the central charge down respective axises which are perpendicular to the planes of the cube which they pass through the center of (does that make sense?) This distance from the central charge is an unnecessary distance. I need to determine the electric flux through one of the six planes.

    2. Relevant equations
    Flux=q/(epsilon 0)

    3. The attempt at a solution
    Well, I'm having a little trouble (I assume my brain just isnt functioning well tonight). I could not see why the distance from the central charge doesnt matter, so I sort of ignored that and assumed that if that is true, it would be fine the put the six charges in contact with the planes.
    So I basically added up all of the fluxes. I did Q/(6e) for the middle, q/(2e) for the charge in contact with the surface I care about. I had trouble with the one across from the surface I am fluxing and now realize why my answer for that was wrong. Once I get that one, I can subtract the percents of flux from the one across and the one in contact from 1 and divide that by 4 and multiply that value by q/e and then multiply it by 4.
    I know there must be an easier way to do this!
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?