A thin square metal plate is 1.00 m on a side is located in the xz-plane. A charge of 400 nC is placed on the plate and can be taken to be distributed uniformly. Determine the
a. charge per unit area on each face of the plate.
b. the electric field 1.00 cm in the +y-direction from the plate.
c. the electric field 1.00 cm in the -y-direction from the plate.