Homework Help: Infinite sheets of charge

1. Feb 17, 2009

rgalvan2

1. The problem statement, all variables and given/known data
Two infinite sheets with surface charge density σ1 and σ2, respectively, are oriented perpendicular to the x-axis. An infinite, conducting slab of thickness a is placed between the charged sheets as shown in the figure. The conducting plate has a net charge per unit area of σC.

σ1=8.85$$\mu$$C/m^2
σ2=1.5$$\mu$$C/m^2
σC=-3$$\mu$$C/m^2
a=2cm

2. Relevant equations
E=$$\sigma$$/2$$\epsilon$$0

3. The attempt at a solution

I figured since the magnitude of the electric field is not determined by displacement, I could just use the above equation. The only problem it that the conducting slab has different surface charge density on each side and I'm not sure how to start this. I have an exam tomorrow so any help is greatly appreciated!

I also attached a picture of the problem.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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