Electric field at different distances from a charged sheet

[zoe7777]

Help! Please someone must be able to solve this problem.

At a distance of 0.188 cm from a large uniform sheet of charge, the electric field is 445 N/C. What is the electric field 1.36 cm from the sheet?

 

[StatusX]

how does the field drop off with distance from the plate? as 1/r, as 1/r^2, at all?

 

[mcah5]

For a plate, I think it's 1/r. Not quite sure though.