1. The problem statement, all variables and given/known data For a sheet of infinitesimal area, find the electric field 9 mm from the surface if the charge density is 5 μC/mm^2. 2. Relevant equations E=σ/2ε0 3. The attempt at a solution E=(5x10^-6 C/m^2)/(2*8.85x10^-12) = 2.8 x10^5N/C I know the correct answer is about 5.6x10^11 N/C, but I'm not sure why. Probably units? I'm not sure how to get N/C at the end when I'm given microcoulombs/mm^2 to begin with. Please help! Thank in advance.