What the ultimate
Natural Units
of material are?
How is electricity related to chemistry?
Coulomb Force
Electric charge, like energy, has no mass, size, shape or color. Humans had difficulty understanding it.
W. Gilbert (1544-1603) invented the
electroscope
Charles du Fay (1698-1739) recognized two kinds of electricity -
vitreous
and
resinous
Banjamin Franklin (1706-1790) replaced these terms with
positive
and
negative charges
Charles-Augustin de Coulomb (1736-1806) invented a sensitive torsion balance to measure the forces, and gave the law of electrostatic interaction
F = C
q
1
q
2
-------
r
2
The force can be
attraction
(negative), or
repulsion
(positive)
E-mail:
cchieh@uwaterloo.ca