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Probelm in electrostatiics

  1. Oct 19, 2004 #1
    Hello guys,
    I have a problem with actually starting up this problem (2.6) in "Intrroduction to electrodynamics" Griffiths.


    Find the electric field a distance z above the center of a flat cricular disk of radius R, which carries a uniform surface charge (sigma)?

    I am having problems setting it up especially how 'da' looks like and also the whole integral.

  2. jcsd
  3. Oct 19, 2004 #2


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    Find the electric field produced by an element of charge [itex]\sigma \rho d\rho d\theta[/itex] at a position along the z-axis. You only need to consider the z-component of field due to the symmetry. Then it's just a matter of integration.
    Last edited: Oct 19, 2004
  4. Oct 22, 2004 #3
    Thank you i get it now Tide.
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