Electric field of infinite nonconducting sheets

[nizsu]

Hi, I am doing homework for my physics class and I think I am doing it right but the website keep saying I am wrong. Can anybody tell me where I am wrong? Thank you

Two infinite nonconducting sheets of charge are parallel to each other, with sheet A in the x = -2.85 plane and sheet B in the x = +2.85 m plane. Find the electric field in the region x < -2.85 m, in the region x > +2.85 m, and between the sheets for the following situations.
(a) when each sheet has a uniform surface charge density equal to +3.80 µC/m2

When x< -2.85, E= -4pikσ = -4.3*10^5
When x > 2.85. E = 4pikσ = 4.3*10^5

 

[SammyS]

Hi, I am doing homework for my physics class and I think I am doing it right but the website keep saying I am wrong. Can anybody tell me where I am wrong? Thank you

Two infinite nonconducting sheets of charge are parallel to each other, with sheet A in the x = -2.85 plane and sheet B in the x = +2.85 m plane. Find the electric field in the region x < -2.85 m, in the region x > +2.85 m, and between the sheets for the following situations.
(a) when each sheet has a uniform surface charge density equal to +3.80 µC/m2

When x< -2.85, E= -4pikσ = -4.3*10^5
When x > 2.85. E = 4pikσ = 4.3*10^5

That's what I get too.

Maybe you're expected to include the unit vector, $\hat{i}\,.$