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

Nucleons together in a nucleus, What does held nucleons together in a nucle...

What does held nucleons together in a nucleus? Nuclear force. It is the nuclear force which fasten the nucleons together and is responsible for the stability of nucleus.

Explain the supply current, For the circuit shown in Figure , verify the va...

For the circuit shown in Figure , verify the value of V1. If the total circuit resistance is 36Ω. Determine the supply current and the value of resistors R 1 , R 2 and R 3

How to find the acceleration of a body , How to find the acceleration of a ...

How to find the acceleration of a body in a non inertial frame on the action of friction? Solution) Use the concept of pseudo force. Multiply  the mass of the body of which you

the power consumed, An electric bulb is rated 220 V and 100 W.When it is o...

An electric bulb is rated 220 V and 100 W.When it is operated on 110 V, the power consumed will be. Ans) P=V*I I will be same in both cases so P1=V1*I P2=V2*I Dividing both equati

Explain standing or stationery waves, Standing OR Stationery Waves: Whe...

Standing OR Stationery Waves: When two identical waves of similar amplitude and period moving along the similar line in opposite directions superpose each other, a latest set o

Evaluate refractive index of the material of the prism, Q. A prism is made ...

Q. A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°.What is t

Lamis theorem, a particle of xkg pended by two light inextensible strings o...

a particle of xkg pended by two light inextensible strings of AB and BC of lengths 8cm and 6cm respectively with the mass x attached to B. The end A and C are fixed at the same and

Define optic axis of a crystal, Q. Define: optic axis of a crystal. In...

Q. Define: optic axis of a crystal. In a double refracting crystal there is a particular direction in which both the rays travel with same velocity. This direction is called a

Landauers principle, Landauer's principle: A principle that states it ...

Landauer's principle: A principle that states it doesn't take energy to compute data explicitly, but rather it takes energy to erase any data, as erasure is a significant step

Calculate apparent molar weight - osmotic pressure, 1.  During an experimen...

1.  During an experiment, the osmotic pressure was recorded with respect to different concentrations of an enzyme. The results of the experiment are shown in the table below. a.

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