Capacitors, Physics

Assignment Help:

Capacitors:

When a voltage is applied to a capacitive circuit there is a change in the electric flux. The ease with which this change takes place is a measure of the capacitance of the circuit.

In d.c. circuits, capacitance is only effective when the voltage is switched on and off, but in a.c. circuits where the voltage varies continuously, the effect of capacitance is continuous.

A device used specifically to introduce capacitance into a circuit is known as a capacitor (sometimes called a condenser).

CHARGING A BODY

A conductor is given a positive charge when electrons are forcibly removed from the conductor, eg, by connecting it to the positive pole of a d.c. source. Similarly, when additional electrons are pushed on to a conductor, it is given a negative charge.

The use of force means that energy has been expended by the source of d.c. and this energy is stored in an electric field. An electric field is represented by lines of flux whose direction is the direction of force which would be experienced by a free positive charge placed in the field. Lines of electric flux behave in an analogous manner to lines of magnetic flux.

As the charge on a body increases, it repels further charge with greater force until eventually the repelling force equals the charging force and the conductor is fully charged.

The charge on a fully charged body may be changed by changing the voltage supplying the charging force, but the conductor will oppose this charge due to the charge it already possesses.

Any conductor will hold a charge, the magnitude of the charge depends upon the magnitude of the voltage applied, but for a single conductor, even a large voltage produces only a relatively small charge


Related Discussions:- Capacitors

Adiabatic reversible expansion of a gas, Get an expression relating T and V...

Get an expression relating T and V in an adiabatic reversible expansion of a gas obeying the equation of state PV = nRT.

consevation of angular momentum , It states that angular momentum of a sys...

It states that angular momentum of a system remains conserved if no net torque is acting on the system.

Illustrate the principle of carbon dioxide laser in short, Illustrate the p...

Illustrate the principle of carbon dioxide laser in short. Principle of carbon dioxide (CO 2 ) Laser: To get Laser transition between two levels this is necessary to acquire

Magnitisam, what is magnitisam?how north pole and south pole takes part in ...

what is magnitisam?how north pole and south pole takes part in it?

Huygens principle, Huygen's principl e : Huygen's principle states that eve...

Huygen's principl e : Huygen's principle states that every point of a wave front behaves as the source of small secondary wavelets which spread out in all directions with a velocit

Inertial and non inertial frame of refrence, What is inertial and non inert...

What is inertial and non inertial feame if refrence of reference?

Help, #questionyour dog is running around the grass in your back yard. He u...

#questionyour dog is running around the grass in your back yard. He undergoes successive displacements 3.50 m south, 8.20 m northeast, and 15.0 m west. What is the resultant displa

Determine the speed by using a wheel and axle, Using a wheel and axle Us...

Using a wheel and axle Use the pencil sharpener that you used in experiment A 8. Pull on the end of the string that held the books and observe how rapidly the crank turns.

Explain unit of capacity, Unit of Capacity: The unit of capacity of a c...

Unit of Capacity: The unit of capacity of a capacitor is known as farad (f). It is given by a relation. q = cv.

Internal energy, When do you use Wn instead of work - A?

When do you use Wn instead of work - 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