Answer is given 2 but I am getting 3 And how to determine

Last updated: 6/24/2023

Answer is given 2 but I am getting 3 And how to determine the positive and negative sign Three infinitely charged sheets are kept parallel to x y plane having charge densities as shown in figure The electric field at P is Z 3a Z 2a 11 2 3 Aok 4ok 20 U 1 Z 0 P 20 0