A square insulating sheet 76.0cm on a side is held horizontally. The sheet has 6.30nC of charge spread uniformly over its area.
Part A: Calculate the electric field at a point 0.250 mm above the center of the sheet.
Part B: Estimate the electric field at a point located a distance 185m above the center of the sheet.
Part C: Would the answers to parts A and B be different if the sheet were made of a conducting material?
Please break down every step and do not skip over anything - I have been at this problem awhile and keep getting hung up. Thanks for the help!