An Ideal Parallel-Plate Capacitor Having Circular Plates of Diameter $D$ That Are a Distance

question 100

Multiple Choice

An ideal parallel-plate capacitor having circular plates of diameter $D$ that are a distance $d$ apart stores energy $U$ when it is connected across a fixed potential difference. If you want to triple the amount of energy stored in this capacitor by changing only the size of its plates, the diameter should be changed to

• A) \(\frac { D } { 3 }\)
• B) \(3 D\).
• C) \(D \sqrt { 3 }\)
• D) \(\frac { \mathrm { D } } { \sqrt { 3 } }\)
• E) 9D.

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