Parallel-Plate Capacitor: An ideal air-filled parallel-plate capacitor consists of two circular plates, each of radius 0.30 mm. How far apart should the plates be for the capacitance to be 300.0-pF? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 0.0083 ?m
B. 0.0042 ?m
C. 0.00094 ?m
D. 0.00047 ?m
Answer: A
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