Examkin

Question

Difficulty: EasyCapacitors

In the physical construction of a standard fixed capacitor, what is the primary role of the dielectric material placed between the two conductive plates?

  1. A
    To create an electromagnetic field that opposes rapid changes in circuit current
  2. To act as an insulating barrier that prevents direct electrical contact between the plates while supporting an electrostatic fieldAnswer
  3. C
    To provide a low-resistance path for direct current while completely blocking alternating current
  4. D
    To act as a conductive bridge that allows continuous electron flow across the gap between the plates

Answer

To act as an insulating barrier that prevents direct electrical contact between the plates while supporting an electrostatic field
The dielectric in a capacitor is an electrical insulator (such as ceramic, mica, paper, or air) placed between the conductive plates. Its primary purpose is to physically isolate the plates so direct current cannot cross the gap, thereby allowing equal and opposite charges to accumulate and establish an electrostatic field.

Step-by-Step Solution

1
Identify the basic construction of a capacitor
A capacitor consists of two conducting plates separated by an insulating layer known as the dielectric.
Understanding the physical structure establishes the role of each component.
2
Determine the electrical function of the dielectric material
The dielectric prevents charges on opposite plates from neutralizing each other through direct contact, allowing an electric field to be established and energy to be stored.
Insulators do not allow free electrons to flow through them, maintaining the potential difference between the plates.

Key Concept

Dielectric function and energy storage in capacitors
Estimated Time:45s
Rate this question

Topics

Capacitors

More questions from this topic