Help Please someone must be able to solve this problem.

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The electric field near a large uniform sheet of charge remains constant regardless of distance, meaning it does not drop off like 1/r or 1/r^2. At a distance of 1.36 cm from the sheet, the electric field will still be 445 N/C. This is because the electric field produced by an infinite sheet of charge is uniform and does not vary with distance. The discussion clarifies that the electric field does not decrease with distance from the plate. Understanding this principle is crucial for solving related problems in electrostatics.
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Help! Please someone must be able to solve this problem.

At a distance of 0.188 cm from a large uniform sheet of charge, the electric field is 445 N/C. What is the electric field 1.36 cm from the sheet?
 
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how does the field drop off with distance from the plate? as 1/r, as 1/r^2, at all?
 
For a plate, I think it's 1/r. Not quite sure though.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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