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Dielectric constant is throwing me off

  1. Dec 4, 2012 #1
    A spherical capacitor is formed from two concentric, spherical, conducting shells separated by vacuum. The inner sphere has radius 0.39 m and the capacitance is 108 pF. What is the radius of the outer sphere? Give your answer in meters to the third decimal place.

    C-->Capacitance
    K*C*rb-K*C*ra=ra*rb

    it says its a vacum so I'm using K=1

    but i'm not getting a correct answer?!??!
     
  2. jcsd
  3. Dec 4, 2012 #2

    ehild

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