Free, Bound and Total Charge
In dielectric materials, the total charge of an object can separated into "free" and "bound" charges.
Bound charges set up electric dipoles in response to an applied electric field E, and polarize other nearby dipoles tending to line them up, the net accumulation of charge from the orientation of the dipoles is the bound charge. They are called bound because they cannot be removed: in the dielectric material the charges are the electrons bound to the nuclei.
Free charges are the excess charges which can move into electrostatic equilibrium, i.e. when the charges are not moving and the resultant electric field is independent of time, or constitute electric currents.
Read more about this topic: Charge Density
Famous quotes containing the words bound, total and/or charge:
“Successful socialism depends on the perfectibility of man. Unless all, or nearly all, men are high-minded and clear-sighted, it is bound to be a rotten failure in any but a physical sense. Even through it is altruism, socialism means materialism. You can guarantee the things of the body to every one, but you cannot guarantee the things of the spirit to every one; you can guarantee only that the opportunity to seek them shall not be denied to any one who chooses to seek them.”
—Katharine Fullerton Gerould (1879–1944)
“... geometry became a symbol for human relations, except that it was better, because in geometry things never go bad. If certain things occur, if certain lines meet, an angle is born. You cannot fail. It’s not going to fail; it is eternal. I found in rules of mathematics a peace and a trust that I could not place in human beings. This sublimation was total and remained total. Thus, I’m able to avoid or manipulate or process pain.”
—Louise Bourgeois (b. 1911)
“Martial, the things for to attain
The happy life be these, I find:
The riches left, not got with pain;
The fruitful ground, the quiet mind;
The equal friend; no grudge nor strife;
No charge of rule nor governance;”
—Martial (Marcus Valerius Martialis)