You measure the electric field strength at points directly above the center of a square plate carrying

Question:

You measure the electric field strength at points directly above the center of a square plate carrying charge spread uniformly over its surface. The data are tabulated in the next column, with x the perpendicular distance from the center of the plate. Use the data to determine(a) the total charge on the plate(b) the plate?s size. You?ll need to consider separately data taken close to the plate and also far away. For the latter, plot E versus a quantity that should yield a straight line.