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

Gravity, Can anyone give me a clear picture of GRAVITY?How does it works an...

Can anyone give me a clear picture of GRAVITY?How does it works and and where does it pulls everthing?

Calculate the longest wavelength, Q Calculate the longest wavelength that c...

Q Calculate the longest wavelength that can be analysed by a rock salt crystal of spacing d = 2.82 Ao in the first order. Data: d = 2.82 Å = 2.82 × 10-10 m; n = 1 ; λmax = ?

Entropy., 84.1grams of He are compressed reversibly and isothermal at 100.0...

84.1grams of He are compressed reversibly and isothermal at 100.0C from 28.0Litre to 7.37Litres. Calculate the the entropy change in joules/K.

Determine number of neutrons in nucleus of the atom, An atom has 26 electro...

An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be : (1) 26      (2) 30        (3) 36                     (

Wiedemann-franz law, Wiedemann-Franz law: The ratio of thermal conduct...

Wiedemann-Franz law: The ratio of thermal conductivity of a particular pure metal to its electrical conductivity is approximately constant for any given temperature. This law

Can you define solar constant, Q. Can you define Solar Constant? The lu...

Q. Can you define Solar Constant? The luminosity of the Sun L is 3.827×10 26 Watts. When the Sun is straight overhead on a clear day how many watts would we expect to illumina

Strong anthropic principle, A more forceful argument which the weak princip...

A more forceful argument which the weak principle: This implies that if the laws of the Universe were not favorable to the development of intelligent creatures to ask regarding the

Lqws of motion, why newtons 2nd law is called the real law of motion?

why newtons 2nd law is called the real law of motion?

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