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Imagine that Jae has two infinite size metal plates with an opposite charge and has placed...

Imagine that Jae has two infinite size metal plates with an opposite charge and has placed them parallel with respect to each other. Calculate the size of the electric field in terms of the area charge density of the plate. Estimate the same when one of plate has nine times of the charge density of the other. Assume that the permittivity constant is unity. Please explain thoroughly and write neatly!

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