1. The problem statement, all variables and given/known data 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? 2. Relevant equations 3. 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.