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surface resistance between 2 points

Discussion in 'Electronic Basics' started by rab, Feb 25, 2005.

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  1. rab

    rab Guest


    I have a discussion with a collegue. We have material with 1 M/square
    surface resistance. What is the resistance between 2 points (diameter 1 mm
    round) seperated by 20 mm. Is there a formula somewere or a place to look.

  2. Look for the formula giving the capacitance
    between adjacent round conductors. Except
    for the constant term and the fact that one is
    per unit length and the other not, the formula
    will be the same. Just substitute conductivity
    for permeability per unit length.
  3. Jamie

    Jamie Guest

    not sure on your question format "1 M/square" ?

    1 meter per square? or 1 meg ohm per square?

    and when you say round?, are we talking about a
    round like in a doughnut? or a sphere ?
  4. John Larkin

    John Larkin Guest

    There is an equation. Google "surface resistance two contacts" or
    something similar.

    (rho/dz)log(L/r)/pi or something.

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