Which of the following is a correct expression for the electric field inside the surface of the plate a short distance off the center of the surface plate?
a) [E = (σ / (2ε₀)) + (σ / (4ε₀))] at a short distance off the center
b) [E = (σ / ε₀)] at the center of the plate
c) [E = (2σ / ε₀)] at the edge of the plate
d) [E = (σ / (3ε₀))] at the corner of the plate