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[help] finding the total electric flux

  1. Apr 13, 2014 #1
    Hello Guys !!!

    iam studing the electric flux and how the relationship between D ( electric flux density ) and E ( elecric field)


    but i found this problem and i don't know which formula should i use to solve it to find the electric flux

    i know that Q=(Psi)=the electric flux but i don't know how to use this to solve this problem

    i tried to use the integration of the volume of the sphere which is r^2 sin(ceta)*dr*d(ceta)*d(phi)

    but i didn't reach to the number in the solution ....I need your help !!

    MhjsfpZ.png
     
  2. jcsd
  3. Apr 13, 2014 #2

    rude man

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    You don't integrate over volume, you integrate over surface area.
     
  4. Apr 13, 2014 #3
    hmmm , this means that i will integrate r^2 sin(ceta) *d(ceta)*d(phi) ??
     
  5. Apr 13, 2014 #4

    rude man

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    You don't actually perform any integration. You use Gauss's theorem thruout.
     
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