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## Homework Statement

An infinite slab of uniform charge density ρ occupies the region -∞<x< ∞, -∞<y<∞, -d/2<z<d/2.

## Homework Equations

Use Gauss' Law to calculate the electric field density for -∞<z<∞

## The Attempt at a Solution

D=εE.

Using that, I just need to find D = [itex]\frac{1}{4*Pi}[/itex]∫[itex]\frac{ρ}{r^2}[/itex]dv.

But I don't know what to use as a radius...