Each Plate of an Ideal Air-Filled Parallel-Plate Capacitor Has an Area

Multiple Choice

Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0020 $m ^ { 2 }$ , and the separation of the plates is $0.090 \mathrm {~mm}$ An electric field of $2.1 \times 10^6 \mathrm {~N} / \mathrm { C }$ is present between the plates. What is the surface charge density on the plates? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

A) 19 µC/m²
B) 39 µC/m²
C) 9.3 µC/m²
D) 28 µC/m²
E) 47 µC/m²