Find the electric field at a height z directly above ( 0) the center of a square sheet with sides of length l and a uniform surface charge σ. check your result for the limiting cases l + x and z l. hint: when i say "check your result", i mean that your answer should reduce to something more familiar in those two cases. when l → oo it should look like the electric field for an infinite charged sheet. when z l it should look (approximately) like the electric field due to a point charge q = l2ơ