Factors affecting capacitance, Physics

Assignment Help:

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.

 


Related Discussions:- Factors affecting capacitance

Show the linked representation of the graph, Q. Show the linked representat...

Q. Show the linked representation of the graph.                                                            Ans: The linked representation of given graph is:

The size of nucleus is measured, The size of nucleus is measured in: (1...

The size of nucleus is measured in: (1)amu (2)Angstrom (3)Fermi (4)cm Ans: (3)Fermi

B-h curve, BH curve: For any ferromagnetic material there is a definite...

BH curve: For any ferromagnetic material there is a definite value of flux density (B), corresponding to a specified value of magnetising force (H).  These values can be ascert

What type of material in optical fibres used, What type of material in opti...

What type of material in optical fibres used? Material in optical fibres: Optical fibres are generally made along with two kinds of materials that are glass (silica) and pla

Evaluatre the magnitude of the gravitational force, A 2400-kg satellite is ...

A 2400-kg satellite is in a circular orbit around a planet. The satellite travels with a constant speed of 6.67x10 3 m/s. What is the acceleration of the satellite? Determine the m

Nature of light, An electron is in a box of width 3*10^-10m.what are de bro...

An electron is in a box of width 3*10^-10m.what are de broglies wavlength and magnitude of momentum of the electron if it is in A)n=1 level B)n=2 level C)n=3 level Ans) use the

What is an effect wheel, What is an effect wheel? A disc of polycarbona...

What is an effect wheel? A disc of polycarbonate or metal revolving among the lamp and the common end along with holes, slits, patterns or colors.

Why is quantum mechanics important, Why is quantum mechanics important? ...

Why is quantum mechanics important? Quantum mechanics is important to understand the behavior of systems at atomic length scales and duration smaller. For illustration, when Ne

What is heat?, What is Heat? We now have several scales for measuring tem...

What is Heat? We now have several scales for measuring temperature, but first let's ask, “Is temperature the same as heat?” If I add heat to a pot of water, the water's temperatu

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd