1. Electrostatics Ch. 20

2. Electrical Charge Positive – protons Negative – electrons
Only electrons jump from one object to another.
Positive Charge – loss of electrons
Negative Charge – gain of electrons
Like charges repel
Opposite charges attract

3. Polarization
Separation of Charges

4. Charging By Conduction
Charging a neutral body by touching it with a charged body

5. Charging By Induction
Charging of an object without touching it

6. Insulators – materials through which charges will not easily move
Conductors – materials through which charges will easily move

7. Coulomb’s Law
The force between 2 charges is proportional to the size of the charges and inversely proportional to the square of the distances.
F= k(qAqB/d2)
k = constant = 9.0 x 109 N.m2/c2

8. SI unit of charge is the Coulomb (c)
1 coulomb is the charge of 6.25 x 1018 electrons or protons
1 electron = -1.6 x C
A lightning bolt is about 10 coulombs