Electrostatics, Physics

An uncharged capacitor with a solid dielectric is connected to a similar air capacitor charged to a potential of V0. If the common potential after sharing of charges becomes V, then the dielectric constant of the dielectric must be ?

Capacitor or condenser, device for the storage of electric charge. Simple capacitors have two plates made of an electrically conducting material (e.g., a metal) and divided by a nonconducting material or dielectric (e.g., glass, paraffin, mica, paper, oil, tantalum, or air). The Leyden jar is a simple capacitor. If an electrical potential (voltage) is applied to the plates of a capacitor (e.g., by connecting one plate to the positive and the other to the negative terminal of a storage battery), the plates will become charged, one positively and one negatively. If the externally applied voltage is then removed, the plates of the capacitor remain charged, and the presence of the electric charge induces an electrical potential between the plates. This phenomenon is known as electrostatic induction. The capacity of the device for storing electric charge (i.e., its capacitance) can be increased by increasing the area of the plates, by decreasing their separation, or by changing the dielectric. The dielectric constant of a particular dielectric is the measure of the dielectric''s unit capacitance. It defines the ratio of the capacitance of a dielectric-filled capacitor to a capacitor of the similar size with a vacuum between the plates. Capacitors are used in many electrical and electronic devices. The main capacitor classifications are non-polarized (used for AC circuits) and polarized (used for DC circuits). Capacitors can also be classified as fixed or variable. One type of variable capacitor, formerly used in radio and television tuning circuits, consisted of two sets of semicircular plates, one fixed and the other mounted on a movable shaft. By rotating the shaft the area of overlap of the two plates increases or decreases, therefore increasing or decreasing the capacitance. These devices have largely been replaced by frequency synthesizers and a special type of solid-state diode, known as a varactor, whose capacitance changes with the reverse-biased voltage across it.

Posted Date: 3/9/2013 7:21:58 AM | Location : United States

Related Discussions:- Electrostatics, Assignment Help, Ask Question on Electrostatics, Get Answer, Expert's Help, Electrostatics Discussions

Write discussion on Electrostatics
Your posts are moderated
Related Questions
Q. What is acceptor circuit ? Give the uses of it. Acceptor circuit The series resonant circuit is frequently called an acceptor circuit. By proffering minimum impedan

A piece of flint glass is lying on top of a container of water (see figure below). When a red beam of light in air is incident upon the flint glass at an angle of 28°. What i

what will happen if we will walk with the speed of light or faster than it?

Hello! I would like to ask if there is a job in Physics which is 24/7 Question Answering/problem solving and if any, I would like to apply for it. Thank You Prerak Dhawan

A transformer has 124 turns on the  primary coil and 18,600 turns on the  secondary coil. a. Is this a step-down or a step-up  transformer? step-up transformer

If zoe kicked a soccer ball with an initial velocity of 8.25 m/s at an angle of 15.0 degrees, what horizontal distance would it travel?

standard dimensions of a tanker truck for storage of crude oil ... metion its length , siameter, thickness of insulation

a tiny air bubble inside a glass slab appears to be 6 cm deep when viewed from one side and 4 cm deep when viewed from other side. find the thickness of slab

As a longitudinal wave moves through a medium, the particles of the medium: w) Vibrate in a path parallel to the path of the wave x) Vibrate in a path perpendicular to t

A strip of aluminium of mass 40.7g is dropped into a beaker of dilute hydrochloric acid. Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 26.1 o C ) by