Red Seal Electrician Practice
Wiring and componentsQuestion 854 of 1506

Which construction gives the highest capacitance values?

  1. A microscopically thin oxide layer between two conductors
  2. Two large metal plates separated by an air gap
  3. A coil wound on an iron core
  4. A single plate in a plastic case
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Correct answer: A microscopically thin oxide layer between two conductors

A thinner insulator between the conductors gives more capacitance in a small size.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 13.1: Electric Fields and Capacitance

Practice wiring and components

Questions last reviewed: 18 October 2026