Electric Charge & Electric Field Calculation Physics Exercise Problems

A 3.0-pFcapacitor consists of two large closely-spaced parallel plates that have surface charge densities of ± 1.0 nC/mm2. If the potential across the plates is 230 kV with only air between them, find the surface area of each of the plates. (ε0 = 8.85 × 10-12 C2/N • m2)