An insulating sheet 5.0 m x 5.0 m carries a net charge of 2.0 µC. What is the electric field at a point 3.5 cm above the center of the sheet?
a) 3.72 x 104 N/C
b) 4.52 x 103 N/C
c) 2.50 x 104 N/C
d) 1.65 x 103 N/