Suppose an electric field E(x, y, z) has the form Ex = ax, Ey = 0, Ez
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Suppose an electric field E(x, y, z) has the form Ex = ax, Ey = 0, Ez = 0 where a is a constant. What is the charge density? How do you account for the fact that the field points in a particular direction, when the charge density is uniform? [This is a more subtle problem than it looks, and worthy of careful thought.]
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