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Homework Help: Finding the ratio of the inner and outer radii

  1. Sep 29, 2005 #1
    I'm not sure how to use the formula in this problem (C/L = (2*pi*E_0)/(In(r_b/r/a)), A cylindrical air capacitor with a length of L stores an amount of energy equal to W when the potential difference between the two conductors is V. So the magnitude of the charge on each conductor would be 2W/V, now how do you calculate the radii of the inner and outer conductors?
  2. jcsd
  3. Sep 30, 2005 #2


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    Is there is any other formula for energy involving capacitance C and potential difference V.
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