Factors affecting capacitance, Physics

Factors affecting capacitance:

The factors which affect the capacitance of a parallel-plate capacitor are:

  • Overlapping area of the plates (A). The capacitance increases as the area of overlap increases since a larger plate area provides more room to accommodate the increase charge.
  • Distance between the plates (d). The capacitance increases as the distance between the plates decreases, since the electric field then becomes more concentrated.
  • Material between the plates. This introduces a constant called the absolute permittivity (ε). The constant  ε is actually the product of two constants, the permittivity of space ( εo) which has a value of 885 x 10-12 Fm-1 and the relative permittivity (εr), which is basically a multiplication factor (no units) that indicates how many more times the material is able to concentrate the electric flux compared with space. For example, if waxed paper is inserted between the plates instead of air, the ability to concentrate a flux (the permittivity) is multiplied by approximately 3, therefore the relative permittivity ( εr) of waxed paper is approximately 3.

We may summarise this in equation form as:

                  C = εA/d

The units of 'C' are Farads if the units of the other quantities are:

  • Area (a) - square metres (m2).
  • Distance between plates (d) - metres (m).
  • Absolute permittivity (ε) - farads per metre (Fm-1).

In the case of multi-plate capacitors, capacitance is calculated using the formula: C = [(n-1)εA]/d

Where n is the number of plates and A is the area of a single plate.

 

Posted Date: 9/13/2012 4:20:39 AM | Location : United States







Related Discussions:- Factors affecting capacitance, Assignment Help, Ask Question on Factors affecting capacitance, Get Answer, Expert's Help, Factors affecting capacitance Discussions

Write discussion on Factors affecting capacitance
Your posts are moderated
Related Questions
A ball with an initial momentum of 6.00 kg.m/s bounces off a wall and travels in the opposite direction with a momentum of 4.00 kg.m/s. What is the magnitude of the impulse ac

What is Parallel-Plate Capacitor Parallel-Plate Capacitor:  Device used to keep electrical potential energy and charge.  It having of two conducting sheets with equal and oppos

What are basic attenuation mechanisms in a fibre? The fundamental attenuation mechanisms into a fibre are as follows: a. Absorption b. Scattering (Mie and Rayleigh scatte

Two friends are at the local high school track, a circle measuring 440 yards for one complete lap. Abe can jog at 8.2 miles per hour while Bob’s jogging speed is 4.6 miles per hour


What do you mean by dispersion of light? Write down the expression for the deviation produced by a thin prism?

Unit of Charges: The S.I unit of charge is Coulumb represented by "c".

Gaia hypothesis (J. Lovelock, 1969): The idea that as a whole Earth should be regarded as a living organism & that biological procedure stabilize the environment.

do you provide help in computational physics matlab?

Alfonso and Sarah like to go sky diving together. Alfonso has a mass of 88 kg, and Sarah has a mass of 66 kg. While in free fall together, Alfonso pushes Sarah horizontally with a