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That's that rho of s

  1. Sep 7, 2013 #1
    Please help me. What does the Prof. Walter Lewin mean by this "that is that rho of s"?
    Here is the video: http://www.youtube.com/watch?v=rp1orH7OC1c&list=SP854AA255B15C574C&index=17#t=31m20

     
  2. jcsd
  3. Sep 7, 2013 #2

    Pythagorean

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    I think he starts talking about it around 8:30 and eventually makes his way to the right end of the board around 9:30. He has an electric field dependent on rho_s I think he meant "rho sub s" (rho with subscript s).
     
  4. Sep 7, 2013 #3
    Thanks. Can you explain why the positive or negative of these wires are related to the rho of s?
     
  5. Sep 8, 2013 #4
    Any help?
     
  6. Sep 8, 2013 #5

    Pythagorean

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    I don't remember the exact setup and currently on mobile, but I thought the setup was the two wires were each on opposite terminals of a battery, so you have a positive charge on one wire and a negative on the other.
     
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