What is the surface charge density?

AI Thread Summary
The discussion focuses on calculating the potential difference and surface charge density between two parallel metal plates with opposite charges. The potential difference is determined to be 1.824 V, with the positively charged plate at a higher potential. The main challenge arises in calculating the surface charge density on the positive sheet, which is not clearly understood by the poster. Participants suggest consulting the textbook for information on the electric field produced by an infinite sheet of charge, which is essential for solving this problem. Understanding these concepts is crucial for accurately determining the surface charge density.
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Homework Statement


Two large parallel metal plate sheets carrying opposite electric charges of equal magnitude are separated by a distance of 38.0mm. The electric field between them is uniform and has magnitude 480 N/C.

a) What is the potential difference between the sheets?
b) Which sheet is at higher potential, the one with positive or negative charge?
c) What is the surface charge density D on the positive sheet?

Homework Equations


The Attempt at a Solution



I have solved a and b.

a) W/q = Potential Difference = Ed = 480(0.0038) = 1.824 V
b) Positive charge

For letter C, I have no idea how do it. It's my first time encountering the term surface charge density on this kind of problem... Pleas help.
 
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Consult your text. I'm sure your book talks about the electric field due to an infinite sheet of charge.
 
vela said:
Consult your text. I'm sure your book talks about the electric field due to an infinite sheet of charge.

Can you elaborate further? I didn't quite understand.
 
I'm saying read your textbook. You should know the electric field for three common charge configurations: a point charge, a line charge, and a sheet of charge. Your book will cover these.
 

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