Skip to main content

How the capacitor is work in electrostatic induction?

A capacitor is most simply defined as two conductors separated by a dielectric. It is easier to grasp the significance of this definition by looking at a commonly used model for a capacitor that is shown here. A capacitor is also called a condenser.

A dielectric is a material that is a good insulator (incapable of passing electrical current), but is capable of passing electrical fields of force.
Some examples dielectric materials:
vacuum  ,air  ,aluminum oxide  ,various ceramics  ,Barium titanate   ,glass  ,water  ,mica  ,oil etc .

 Charged Capacitor

A capacitor is said to be charged when there are more electrons on one conductor plate than on the other.
The plate with the larger number of electrons has the negative polarity. The opposite plate then has the positive polarity.
When a capacitor is charged, energy is stored in the dielectric material in the form of an electrostatic field.

Electrostatic Induction  
When an electron is added to one plate of a capacitor, one electron is driven away from the opposite plate.
Or you can say that when an electron is pulled away from one plate of a capacitor, another electron is drawn to the opposite plate.

No matter how you look at it, this is the principle of electrostatic induction at work in a capacitor.

When this electrostatic effect increases the imbalance of electrons between the two plates:
The electrostatic field grows stronger.
The amount of energy stored in the dielectric increases.
The capacitor is said to be charging.
When this electrostatic effect decreases the imbalance of electrons between the two plates:

The electrostatic field grows weaker.
The amount of energy stored in the dielectic decreases.
The capacitor is said to be discharging.


  1. Nice blog! Is your theme custom made or did you download it from somewhere?
    A design like yours with a few simple tweeks would really make my blog jump out.

    Please let me know where you got your design. Thank you

    My web-site - smash Bandits Hack


Post a Comment

Popular posts from this blog



In  this  configuration  the  input  is  applied  between the  base  and  the  collector and  the  output  is  taken  from  the  collector  and  the  emitter.  Here  the  collector  is common to both the input and the output circuits as shown in Fig.

  Common Collector Transistor Circuit

In  common  collector  configuration  the  input  current  is  the  base current  IB  and  the output current is the emitter current IE. The ratio of change in emitter current to the  change in the base current is called current amplification factor.

It is represented by


A test  circuit  for determining the  static characteristic  of an NPN transistor is shown in Fig. In this circuit the collector is common to both the input and the output circuits.   To   measure   the   base   and   the   emitter   currents,   milli   ammeters   are connected in series with the base and the emitter circuits. Voltmeters are connected   across the input an…

XII - Ch# 12 : Electrostatics :Solved Numericals

Solution Manual : Mathematical methods for physicists 5th edition Arfken and Weber

DJ VU Reader
Book Description Now in its 7th edition, Mathematical Methods for Physicists continues to provide all the mathematical methods that aspiring scientists and engineers are likely to encounter as students and beginning researchers. This bestselling text provides mathematical relations and their proofs essential to the study of physics and related fields. While retaining the key features of the 6th edition, the new edition provides a more careful balance of explanation, theory, and examples. Taking a problem-solving-skills approach to incorporating theorems with applications, the book's improved focus will help students succeed throughout their academic careers and well into their professions. Some notable enhancements include more refined and focused content in important topics, improved organization, updated notations, extensive explanations and intuitive exercise sets, a wider range of problem solutions, improvement in the placement, and a wider ra…