Electric fields through parallelepiped

AI Thread Summary
The discussion revolves around the application of Gauss's law to a parallelepiped in an electric field, specifically regarding the calculation of charge inside the shape. The user successfully determines the charge but is uncertain about the implications of the electric field configuration involving infinite parallel plates. They propose that the fields from the plates could superimpose to yield the correct total fields at specific locations. The user seeks validation on their reasoning and asks for clarification on the total flux if the field originates from external charges. The inquiry highlights the complexities of electric field interactions in geometrically defined regions.
Fluxthroughme
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I have taken my Gauss surface as the front of the shape, with E_1 coming through uniformly. I get the right answer for the charge inside the shape, but I'm unsure about b. I imagine a situation that I've drawn could be possible, but I've never seen it before, so I do not know. I'm thinking that the parallelepiped is going through one of the plates involved in an infinite parallel plate set up, with a single infinite plate above them. The two fields would combine as I have labelled, and would, by superposition, give the right total fields at the places they required. If anyone could let me know whether this is fine, or just nonsense, it'd be helpful. Thank you.
 
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If the field were due to charges outside the parallelepiped, what would be the total flux?
 

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