Parallel-Plate Capacitor: 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 23.0 kV with only air between them, find the surface area of each of the plates. (?0 = 8.85 × 10-12 C2/N ? m2)
A. 69 mm2
B. 0.014 mm2
C. 35 mm2
D. 0.0072 mm2
Answer: A
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