|MadSci Network: Physics|
Hello Thomas, Attention to detail is important in science, and yours is good. The problem here is nomenclature -- the words we use to describe things. Sears and Zemansky, in University Physics (mine is the Third Edition from 1964 -- Addison-Wesley) describe your Gauss's Law analyses exactly in a section called "Applications of Gauss's Law." What you call a "Sheet of Charge, where the E field comes out of both sides of the sheet," Sears and Zemansky call "...an infinite charged conducting plate." What you call a "Wall Surface where the E field comes out of only the surface that has the charge aligned all across it," S&Z call "...an infinite plane sheet of charge." So your "Wall Surface" is a "sheet" in Z&K, and they analyze the infinite charged conducting plate as two sheets. Each sheet contributes its own field, and the two fields can be superimposed. This is called "superposition" and is often used where linear relations among variables exist. So, change your "sheet" to "plate," and your "Wall Surface..." to "sheet," and Sears and Zemansky can help. Thanks for your clear problem descripton -- it made finding the difficulty easy. Larry Skarin
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