Two infinite, uniformly charged, flat surfaces are parallel to each other. One of the sheets has a charge density of $+20\mathrm{.}0$ pC$/$m$2,$ and the other carries a charge density of $-40\mathrm{.}0$ pC$/$m$2.$ What is the magnitude of the electric field at any point between the surfaces?$$

Correct!

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$6\mathrm{.}78$ N$/$C

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$2\mathrm{.}75$ N$/$C

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$2\mathrm{.}82$ N$/$C

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$3\mathrm{.}37$ N$/$C

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$4\mathrm{.}45$ N$/$C