What is charge? i know that it is of two types positive and

[nouveau_riche]

what is charge?
i know that it is of two types positive and negative, i need the physical interpretation

and it would be really helpful if anyone can tell something about the history of discovery of charge,well i know about the discovery of electrons and all that ,what i am interested in is how the physicist could make something as anode/cathode if they were discovering the nature of cathode rays?

 

[Drakkith]

Electric Charge: http://en.wikipedia.org/wiki/Electric_charge

I don't really know what you are asking for with your 2nd question. An anode/cathose is simply a charged object such as a metal plate. It was known about long before the discovery of the electron.

 

[Studiot]

I posted this in post#21 of this thread

https://www.physicsforums.com/showthread.php?t=489731&highlight=potential&page=2

So try this.

Charge, like mass, is a property of matter.
It is more complicated than mass because simple experiments show that there are two types or polarities.
All matter possesses mass, but not all matter possesses charge.

Experiments show that uncharged (neutral) matter exerts a force of attraction between two masses and that this force is governed by the inverse square law. We call this gravitational attraction.

Work is therefore done on the mass of any matter moved against this force.

Further experiments show that an additional force exists between charged matter, over and above that exerted by gravity. It is further observed that the direction of this force depends upon the relative polarities of the participating charges. We call this electrostatic attraction or repulsion.

Work is therefore done on the mass of any matter that we move against this force.

It is often stated, rather loosely, that work is done on the charge. This is not so. Work is done on the mass of the matter. So you will find the mass of the charged particle appear in many equations.

It just so happens that the units chosen hide this so the standard definition of the volt, referred to by Sophie Centaur is defined in terms of a force exerted by a fixed number of electrons and a distance. In other words our units of charge incorporate a mass term.


hope it helps.

 

[That Neuron]

Yeah, pretty much everything Studiot said is correct, I would also just like to point out the connection between magnetism and electricity...which gives rise to electromagnetic charge. And also like gravity charge propagates through the inverse square law.

But what I would like to ask, is if charge is a property arising from the various groups and interactions of elementary particles, or does it only appear in the hydron? (with the exception of electron)

 

[Drakkith]

Charge is a property of matter. An electron has a negative charge while a proton has a positive charge. Whether or not these particles are in atoms matters not. There are other charged particles as well, but none are stable.

 

[nouveau_riche]

Electric Charge: http://en.wikipedia.org/wiki/Electric_charge

I don't really know what you are asking for with your 2nd question. An anode/cathose is simply a charged object such as a metal plate. It was known about long before the discovery of the electron.

as you say about anode/cathode(that it was known of them long before discovery of electron)
but how were anode/cathode discovered?

 

[Dickfore]

what is charge?
i know that it is of two types positive and negative, i need the physical interpretation

and it would be really helpful if anyone can tell something about the history of discovery of charge,well i know about the discovery of electrons and all that ,what i am interested in is how the physicist could make something as anode/cathode if they were discovering the nature of cathode rays?

Please enroll in a course on Electromagnetism at your local higher education Institution.

 

[nouveau_riche]

Please enroll in a course on Electromagnetism at your local higher education Institution.

if you are enrolled already,you can be of some help i guess

 

[Dickfore]

if you are enrolled already,you can be of some help i guess

To answer your question, one needs to write a long text the size of a term report. Since I am not getting any marks for this, I think I will skip the opportunity.

 

[nouveau_riche]

To answer your question, one needs to write a long text the size of a term report. Since I am not getting any marks for this, I think I will skip the opportunity.

so must not post any comment here,because no one is going to give you marks

 

[Dickfore]

It's one thing to post one or two paragraphs worth of an answer that would relate to a question that is sufficiently narrow in breadth and put in a succinct form, but it's another thing to write you a term paper on a broad subject. It's like saying: "I don't understand what Quantum Mechanics is. It would be helpful if someone could say something about the history of the development of the theory, the fundamental experiments that were performed and the people who are authorities on the matter. Thank you."

 

[nouveau_riche]

It's one thing to post one or two paragraphs worth of an answer that would relate to a question that is sufficiently narrow in breadth and put in a succinct form, but it's another thing to write you a term paper on a broad subject. It's like saying: "I don't understand what Quantum Mechanics is. It would be helpful if someone could say something about the history of the development of the theory, the fundamental experiments that were performed and the people who are authorities on the matter. Thank you."

my demand was to put a historical background for that,if you know it,you can abstract that out and if you don't ,say that aloud

 

[Dickfore]

Taken from http://en.wikipedia.org/wiki/Electric_charge#History

History

As reported by the ancient Greek philosopher Thales of Miletus around 600 BC, charge (or electricity) could be accumulated by rubbing fur on various substances, such as amber. The Greeks noted that the charged amber buttons could attract light objects such as hair. They also noted that if they rubbed the amber for long enough, they could even get an electric spark to jump. This property derives from the triboelectric effect.

In 1600, the English scientist William Gilbert returned to the subject in De Magnete, and coined the New Latin word electricus from ηλεκτρον (elektron), the Greek word for "amber", which soon gave rise to the English words "electric" and "electricity." He was followed in 1660 by Otto von Guericke, who invented what was probably the first electrostatic generator. Other European pioneers were Robert Boyle, who in 1675 stated that electric attraction and repulsion can act across a vacuum; Stephen Gray, who in 1729 classified materials as conductors and insulators; and C. F. du Fay, who proposed in 1733[1] that electricity came in two varieties which canceled each other, and expressed this in terms of a two-fluid theory. When glass was rubbed with silk, du Fay said that the glass was charged with vitreous electricity, and when amber was rubbed with fur, the amber was said to be charged with resinous electricity. In 1839, Michael Faraday showed that the apparent division between static electricity, current electricity and bioelectricity was incorrect, and all were a consequence of the behavior of a single kind of electricity appearing in opposite polarities. It is arbitrary which polarity you call positive and which you call negative. Positive charge can be defined as the charge left on a glass rod after being rubbed with silk.[2]

One of the foremost experts on electricity in the 18th century was Benjamin Franklin, who argued in favour of a one-fluid theory of electricity. Franklin imagined electricity as being a type of invisible fluid present in all matter; for example he believed that it was the glass in a Leyden jar that held the accumulated charge. He posited that rubbing insulating surfaces together caused this fluid to change location, and that a flow of this fluid constitutes an electric current. He also posited that when matter contained too little of the fluid it was "negatively" charged, and when it had an excess it was "positively" charged. Arbitrarily (or for a reason that was not recorded) he identified the term "positive" with vitreous electricity and "negative" with resinous electricity. William Watson arrived at the same explanation at about the same time.

 

[Dale]

In addition to the link on charge there is also this link on the history of electrochemical cells:
http://en.wikipedia.org/wiki/History_of_the_battery

For historical questions like this you will get better answers from Wikipedia than from PF. As Dickfore mentioned, a good treatment of history tends to be rather lengthy and not terribly suitable for someone to produce as a post on a forum.

Do you have further questions about the physics?

 

[Vanadium 50]

If it's not worth your time to write with capitalization and punctuation, why is it worth someone else's time to write something that you could easily find on the internet. Why do you think your time is more valuable than anyone else's?