A square conducting slab with 4 m sides carries a net charge of 72 microC. (micr

Question

A square conducting slab with 4 m sides carries a net charge of 72 microC. (microC is 1*10-6 C)
(a) Find the charge density on each face of the slab and the electric field just outside one face of the slab.

per face = 2.25 C/m CORRECT

E = 254237 NC CORRECT

(b) The slab is placed to the right of an infinite charged nonconducting plane that lies in the yz plane at x = 0. The charge density of the infinite nonconducting plane is 2.8 C/m2. The faces of the slab are parallel to the plane. Find the sign and magnitude of the electric field on each side of the slab (far from its edges so edge effects can be ignored) and the charge density on each face.

Ex, total (right side of slab) =

412429 NC CORRECT
Ex, total (left side of slab, between the slab and the sheet) =

-96044.9 NC CORRECT

****
charge density (right side of slab) = ______ C/m^2 ****************

*****
charge density (left side of slab) = _______ C/m^2 ******************

Im stuck on the last 2, i starred where i need the help. A detailed explanation would great. thanks!

Explanation / Answer

how did you get the Ex total to the right and to the left

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