Parallel-Plate Capacitor: Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0020 m2, and the separation of the plates is 0.090 mm. An electric field of 2.1 × 106 N/C is present between the plates. What is the surface charge density on the plates? (?0 = 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
Answer: A
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