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Homework Help: Electric field of a long line

  1. Jul 2, 2010 #1
    1. The problem statement, all variables and given/known data

    Hi. I want to calculate electric field radiated by 50 Hz transmission line (overhead power line). for this I'm thinking about Gauss law which can help. in this case I have formula E = lambda / 2*pi*eps0*r
    where lambda is charge per unit length (unit: Coloumb / m).
    the problem is that if I want to calculate electric field E, how I can get value for lambda ?... is there another formula for lambda ?
  2. jcsd
  3. Jul 4, 2010 #2
    Finally I've found that
    by Ampers law: B = mu0*I / 2*pi*r
    where B is magnetic field.
    after several operation i.e using Gauss law, by Faraday's law
    B = mu0*eps0*E*v
    after that electric field becomes E= I / 2*pi*eps0*r*v
    where v is prooved to be speed of light. I've tested also this formula by taking into account units,it worked!.
    very cool. I realise that these people were really genios as I'm digging into subject :)
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