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

Gauss's law ?

  1. Jan 28, 2009 #1


    User Avatar

    Hi there,

    I have a question for you guys. It might sound stupid, but I don't get the material; my teacher can't teach!!! and your help is very appreciated

    I am reading about Gauss's law where they come to the conclusion that flux=charge/Eo

    as in this link http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/elesph.html

    my question is why won't the net electric field be zero since we can cancel the field lines?

    Thanks in advance
  2. jcsd
  3. Jan 28, 2009 #2


    User Avatar

    Staff: Mentor

    With what?
  4. Jan 28, 2009 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Why won't the net electric field of what be zero? What field lines are canceling?

    (That link describes the field from a point charge.)
  5. Jan 28, 2009 #4


    User Avatar

    hi.. sorry I didn't mean to be unclear

    True ,, the link describes the field from a point charge so each field line has another field line that is in the opposite direction.. so why don't all the field lines cancel?
    I am sorry I don't know how to explain it better
  6. Jan 28, 2009 #5


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi eRa! Welcome to PF! :smile:
    Flux is through a surface

    all the field lines in the diagram are going the same way through that surface. :wink:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook