# [help] finding the total electric flux

1. Apr 13, 2014

### bibo_dvd

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 !!

2. Apr 13, 2014

### rude man

You don't integrate over volume, you integrate over surface area.

3. Apr 13, 2014

### bibo_dvd

hmmm , this means that i will integrate r^2 sin(ceta) *d(ceta)*d(phi) ??

4. Apr 13, 2014

### rude man

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