# Homework Help: Flux through a square surface

1. Sep 2, 2011

### TheWarHawk

1. The problem statement, all variables and given/known data

A square surface, 34 mm each side, is immersed with an electric field of magnitude 1700 N/C. The field lines make a 35 degree angle with the normal line. Find the electric flux through the surface.

2. Relevant equations

$\oint$E$\cdot$dA

3. The attempt at a solution

Well, since E$\cdot$dA can be rewritten as EA*cos($\Theta$), I did that, and since E and Cos($\Theta$) are constants, I pulled them out of the integral giving me

E*Cos($\Theta$)$\oint$dA

which comes out to be E*Cos($\Theta$)*A, but when I plug in 1700*Cos(35)*.0034$^{2}$ it's wrong.

Any suggestions?

2. Sep 2, 2011

### vela

Staff Emeritus
You've converted mm to m incorrectly.

3. Sep 2, 2011

### TheWarHawk

Sorry, that's a typo on my part, it's supposed to be 3.4 mm

4. Sep 2, 2011

### vela

Staff Emeritus