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Homework Help: Capacitor ? Please Help

  1. Dec 10, 2007 #1
    1. The problem statement, all variables and given/known data
    A 10-cm-diameter parallel-plate capacitor has a 1.0 mm spacing. The electric field between the plates is increasing at the rate 1*10^6V/m/s.

    What is the magnetic field strength 3.0 cm from the axis?

    2. Relevant equations
    B= uo/(2*pi) *r/R^2*(Chang in Q/ change in time)

    3. The attempt at a solution

    I keep getting 2.4
  2. jcsd
  3. Dec 11, 2007 #2
    I think you need to change the unites for the increase rate to C/s.
    anyone knows how?
  4. Dec 11, 2007 #3
    Oh good thinking- I probably need to accound for the charge of an electron.
  5. Dec 11, 2007 #4
    I got the answer from masteringphysics.com 1.67*10^-13 T.
    Now what is the magnetic field strength 7cm from the axis?
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