An Ideal Parallel-Plate Capacitor Having Circular Plates of Diameter D $\sqrt { 3 }$

question 5

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

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