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The phenomena of two objects sticking together
can be explained by the notion that objects when rubbed can gain
a net electric charge. There are two types of charge, labeled
positive ( + ) and negative ( - ), with the following basic property:
Detailed experiments have established the following fundamental
characteristics of electric charge:
- Like charges of the same sign repel each other.
- Unlike charges of the opposite sign attract each other.
This basic unit of charge is conventionally denoted by e :
- Charge is never created nor destroyed - it is conserved.
- Charge always comes in an integral multiple of a basic unit - it
In an atom, the charge on an electron is - e and that on a
proton is + e .
e = 1.602 x 10- 19 Coulombs (C) .