How Does Gauss's Law Apply to Multiple Charged Sheets?

[Seraph404]

Homework Statement

Two very large, nonconducting plastic sheets, each 10.0 cm thick, carry uniform charge densities \sigma1, \sigma2, \sigma3, & \sigma4 on their surfaces, as shown in the figure .

These surface charge densities have the values \sigma1= -6.00E-6 C/m^2, \sigma2= +5.00E-6 C/m^2,\sigma3= +2.00E-6 C/m^2, and \sigma4= +4.00E-6 C/m^2.

A) Use Gauss's law to find the magnitude of the electric field at the point A, 5.00 cm from the left face of the left-hand sheet.

Homework Equations

Gauss's Law

The Attempt at a Solution

Well, at first this confused me because I'm pretty sure I remember that in Gauss's law, electric field depends only on the enclosed charge. But this problem gives me a lot of distances. So I guess the formula

E = \sigma/(2*\epsilon₀ )

doesn't work. That's what I tried, anyway, and got the wrong answer. So, how do I approach a problem like this?

 

[Seraph404]

Okay, I changed the problem.