文档介绍：ELECTRIC FIELDS
Simple Electrostatics
Coulomb’s Law
Electric Field E
Electric Potential V
Gravitational Analogy
Electrostatics is the study of electric charges , the between them and the associated with them.
Simple Electrostatics
Electric charges
Electric charges are measured in , and the charge of an electric is –e, where e = .
Electric charge is , ., it occurs only in discrete amount.
In an isolated system, charge is a .
Insulators and conductors
All electrons in electrical insulators are to their nuclei and the removal or addition of electrons at one places cause the flow of electrons elsewhere.
Electrical conductors have the electrons that are around and the loss or gain of electrons would cause a of those left.
Charging an insulator
An insulator can be charged by , the process in which the outermost shell electrons located near the surfaces are transfered from one body to another.
The excessive electric charge on the insulator is then confined to the .
Charging an insulated conductor
An insulated conductor consists of a conductor mounted on a or suspended from a .
Insulated conductors can be easily charged by an .
+ –
Insulated conductors can also be charged by electrostatic using an electrophorus.
An insulating sheet is initially charged by . A (neutral) metal plate with an handle is then placed on top of th