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Homework Help: Tow cylindrical conducting

  1. Sep 7, 2009 #1
    1. The problem statement, all variables and given/known data

    tow long cylindrical conducting wire ,each of radius a and length l parallel and separated by d , and between the centers of the wires , d>>a ,and the surface charge densities is uniformly,then the total electris potential is the sum of each wire . the effect between them is neglected .

    2. Relevant equations
    show the capacitance of the wire is c=pi (l) epsolen /In(d/a)

    3. The attempt at a solution
    I tryed to separate the electric potential for each and use gauss's law
    first for Q+
    v=-INT E.da
    =-Q/2piepsolin l INT ds/s ,s=a
    but how the limit of the INT will be
    and then find the other v for the other wire with Q-
    I got for c=Q/v =2 pi epsolin l /In (a+/a-)

    or may be use the coulomb's law insted
  2. jcsd
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