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# Two infinite parallel planes have uniform charge densities $\pm \sigma$. What is the electric field in the region between the planes?

$E= \large\frac{\sigma}{2 \in_0}+\frac{\sigma}{2 \in_0}$
$\quad= \large\frac{2 \sigma}{2 \in_0}$
$\quad= \large\frac{\sigma}{\in_0}$