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:
“After which you led me to water
And bade me drink, which I did, owing to your kindness.
You would not let me out for two days and three nights,
Bringing me books bound in wild thyme and scented wild grasses
As if reading had any interest for me ...”
—John Ashbery (b. 1927)
“You have got to prepare for a lifetime of the pillory, for whatever you do will be seen as wrong by total strangers, up until and including the time when whatever your child does will be seen as wrong by total strangers.”
—Sonia Taitz (20th century)
“I charge thee, Satan, housed within this man,
To yield possession to my holy prayers.”
—William Shakespeare (1564–1616)