Consider two thin disks, of negligible thickness, of radiusR oriented perpendicular to thex axis such that the x axis runs through thecenter of each disk

Consider two thin disks, of negligible thickness, of radiusR oriented perpendicular to thex axis such that the x axis runs through thecenter of each disk. The disk centered at x=0 has positive charge density eta, and the disk centered at x=a has negative charge density - eta, where the charge density is charge perunit area. What is the magnitude E of the electric field at the point on thex axis with x coordinate a/2? For what value of the ratio R/a of plate radius to separation between theplates does the electric field at the point x=a/2 on the x axis differ by 1percent from the result eta/epsilon_0 for infinitesheets?I need help with this last part please. I was able to receive helpon the electric field question but I cant seem to figure this oneout. Thanks for the help