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Parallel Plate Capacitor

  1. Jul 19, 2006 #1
    Consider a parallel-plate capacitor constructed from two circular metal plates of radius R. The plates are seperated by a distance f 2.2 mm. What radius must the plates have if the capacitance of this capacitor is to be 2.2microF

    I used the equation C=EA/d

    2.2 x 10^-6 = (8.85x10^-6)(pie r^2)/(2.2 x 10^-3)
    solve for r and I got .01319 m but it's not correct, what am I doing wrong?
  2. jcsd
  3. Jul 19, 2006 #2
    nevermind, i plugged it in wrong. i did it right.
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