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Resistance between spherical conductors

Discussion in 'Electronic Basics' started by [email protected], Mar 26, 2007.

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  1. Guest

    Hi! I have a problem and I have no clue how to do it...

    The space between two concentric spherical-shell conductors is filled
    with a material that has a resistivity of 10^9 ohm meter. If the
    inner shell has a radius of 1.5 cm and the outer shell has a radius of
    5 cm, what is the resistance between the conductors?

    I found a hint that says to find the resistance of a spherical shell
    element of the material of area 4(pi)r^2 and length dr, and integrate
    to find the total resistance of the set of shells in series.

    Any help would be great! thanks
     
  2. Lionel

    Lionel Guest

    You really shouldn't be asking homework questions on Usenet. Have you
    tried asking your official instructor?
     
  3. Phil Allison

    Phil Allison Guest


    ** Try " alt.math ".

    Yours is a math problem, not basic electronics.



    ........ Phil
     
  4. You don't know how to integrate such a function?
     
  5. Dan Coby

    Dan Coby Guest

    Please let him do his own homework. Otherwise he will not learn.
     
  6. John  Larkin

    John Larkin Guest

    That's correct. Treat each shell as a flat sheet of area equal to the
    surface of the shell. That's a good approximation for a thin shell.

    John
     
  7. John  Larkin

    John Larkin Guest

    I didn't do the integration for him. A little visualization sometimes
    helps, and I pretty much rephrased what he already knew.

    John
     
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