A Large,flat Conducting Plate Has a Surface Charge Density $\sigma$ = 80

Multiple Choice

A large,flat conducting plate has a surface charge density $\sigma$ = 8.0 $\times$ 10^-9 C/m² on one of its surfaces.What is the magnitude of the electric field 10 µm from this plate?

A) 72 N/C
B) 0.23 kN/C
C) 0.90 kN/C
D) 90 MN/C
E) 9.0 $\times$ 10¹² N/C