Homework $04$: Ch $23$

Question $17$ of $22$

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In the figure two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have excess surface charge densities of opposite signs and magnitude $7\mathrm{.}40{10}^{-22}\frac{C}{m^2}.$ What is the magnitude of the electric field at points $($a$)$ to the left of the plates, $($b$)$ to the right of them, and $($c$)$ between them?