What is the surface charge density?

[s0mebody]

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.

 

[vela]

Consult your text. I'm sure your book talks about the electric field due to an infinite sheet of charge.

 

[s0mebody]

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.

 

[vela]

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.