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

question 125

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) \(\frac { D } { 3 }\)

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Definitions:

Return on Investment

A measure used to evaluate the efficiency or profitability of an investment, calculated as the ratio of net profit to the initial cost of the investment.

Controllable Margin

The portion of profit or margin over which management has control, usually excluding fixed costs.

Operating Assets

Assets that are used for the day-to-day operations of a business, intended to generate revenue.

Return on Investment

A measure used to evaluate the efficiency or profitability of an investment, calculated by dividing net profit by the initial cost of the investment.