A parallel plate capacitor is made of two circular plates separated by a distance 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3×104 V/m the charge density of the positive plate will be close to:
a. 6×10−7 C/m2
b. 3×10−7 C/m2
c. 3×104 C/m2
d. 6×104 C/m2