85 \times 10^{-12} \, \text{C}^2/\text{N}\cdot\text{m}^2$
Using the formula for electric field due to an infinite charged plane:
$E_1 = \frac{\sigma_1}{2\epsilon_0}$
Substitute the values:
$E_1 = \frac{7 \times 10^{-9}}{2 \times 8.85 \times 10^{-12}}$
$E_1 =
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