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**We have A planar slab of charge with a charge density ρ**

the thickness of the stab is 2*a.

the horizontal y axis passes through the middle of the stab.

the x axis is vertical

a) Find the electric field vector in the region -a<x<a.

_{v}=ρ_{vo}sin(2*pi/(2*a)),for -a<x<athe thickness of the stab is 2*a.

the horizontal y axis passes through the middle of the stab.

the x axis is vertical

a) Find the electric field vector in the region -a<x<a.

I know I need to use the Gauss law.

But I have some problems to establish the integral.

What surface should I take?

I tried the cylinder as surface of integration.

I got:

FLUX=2(pi)x*L*D

_{x}=Q

_{enclosed}

Then I am stuck.

The Q

_{enclosed}integration give me some problem.

Please can someone help me to establish the Gauss law to solve the problem?