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Coulomb's Law and Electric Field

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Three very large square planes of charge are arranged as shown (on edge). From left to right, the planes have charge densities per unit area of -0.50 uC/m^2, +0.10 uC/m^2, and -0.40 uC/m^2. Find the total electric field (direction and magnitude) at the points A, B, C, and D. Assume the plates are much larger than the distance AD.

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From Gauss' Law, E*A=Q/?0. Electrical field contributed from the plates are denoted by E1 ...

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