**Unformatted text preview: **y-z plane at , = x and the other face at a general value . x Then: , : ε ρx E ε ρAx ε Q EA d x encl = ⇒ = = = Φ ≤ with direction given by . ˆ | | i x x Note that E is zero at . = x Now outside the slab, the enclosed charge is constant with : x , : encl ε ρd E ε ρAd ε Q EA d x = ⇒ = = = Φ ≥ again with direction given by . ˆ | | i x x...

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