1. The problem statement, all variables and given/known data A conducting sheet 10m x 10m x 1mm carries a charge of 1 mC. What is the electric field magnitude in kV m-1 just above the centre of the sheet? 2. Relevant equations ρ=Q/Volume E=ρ/2ε0 3. The attempt at a solution I have arrived at an answer by the following: ρ = 1x10-3C / 10m x 10m x 1mm = 0.01C/m3 E = 0.01 / 2 x 8.85x10-12 = 565MV/m However, the answer is given as 565kV/m, which I can only arrive at if I use 8.85x10-9 as the free space permittivity. Where have I gone wrong? Many thanks.