Each Plate of an Air-Filled Parallel-Plate Air Capacitor Has an Area

question 17

Multiple Choice

Each plate of an air-filled parallel-plate air capacitor has an area of 0.0040 m²,and the separation of the plates is 0.080 mm.An electric field of 5.3 × 10⁶ V/m is present between the plates.What is the energy density between the plates? (ε₀ = 8.85 × 10^-12 C²/N • m²)

• A) 124 J/m³
• B) 84 J/m³
• C) 170 J/m³
• D) 210 J/m³
• E) 250 J/m³

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Definitions:

Favorable

A term used to describe outcomes or variances that are positive or beneficial to a business, such as lower costs or higher revenues than expected.

Unfavorable

A term used in budgeting and variance analysis indicating costs exceeded the budget or revenue fell short.

Variable Overhead Efficiency Variance

The difference between the expected variable overhead costs based on standard costing and the actual variable overhead incurred, attributable to efficiency.

Materials Price Variance

The difference between the actual cost of raw materials and the standard cost expected to be paid, reflecting changes in price.