A 30-PFcapacitor Consists of Two Large Closely-Spaced Parallel Plates That Have

question 83

Multiple Choice

A 3.0-pFcapacitor consists of two large closely-spaced parallel plates that have surface charge densities of $\pm 1.0 \mathrm { nC } / \mathrm { mm } ^ { 2 }$ . If the potential across the plates is $23.0 \mathrm { kV }$ with only air between them, find the surface area of each of the plates. $\left( \varepsilon _ { 0 } = 8.85 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 } \right.$ )

• A) \(35 \mathrm {~mm} ^ { 2 }\)
• B) \(69 \mathrm {~mm} ^ { 2 }\)
• C) \(0.0072 \mathrm {~mm} ^ { 2 }\)
• D) \(0.014 \mathrm {~mm} ^ { 2 }\)

---

Definitions:

Stimulant

A compound that increases the activity within the body's physiological or nervous systems.

Nicotine

A stimulant and addictive substance found primarily in tobacco products.

Alcohol

A colorless, volatile liquid that is the active ingredient in drinks such as beer, wine, and spirits, and is also used in sterilization and as a fuel source.

Caffeine

A natural stimulant found in coffee, tea, chocolate, and certain medications that affects the central nervous system, enhancing alertness and reducing tiredness.