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What is the surface charge density?

  1. Mar 12, 2012 #1
    1. The problem statement, all variables and given/known data
    Two large parallel metal plate sheets carrying opposite electric charges of equal magnitude are separated by a distance of 38.0mm. The electric field between them is uniform and has magnitude 480 N/C.

    a) What is the potential difference between the sheets?
    b) Which sheet is at higher potential, the one with positive or negative charge?
    c) What is the surface charge density D on the positive sheet?


    2. Relevant equations



    3. The attempt at a solution

    I have solved a and b.

    a) W/q = Potential Difference = Ed = 480(0.0038) = 1.824 V
    b) Positive charge

    For letter C, I have no idea how do it. It's my first time encountering the term surface charge density on this kind of problem... Pleas help.
     
    Last edited: Mar 12, 2012
  2. jcsd
  3. Mar 12, 2012 #2

    vela

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    Consult your text. I'm sure your book talks about the electric field due to an infinite sheet of charge.
     
  4. Mar 12, 2012 #3
    Can you elaborate further? I didn't quite understand.
     
  5. Mar 13, 2012 #4

    vela

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    I'm saying read your textbook. You should know the electric field for three common charge configurations: a point charge, a line charge, and a sheet of charge. Your book will cover these.
     
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