1. Coulomb Law

2. Warm Up
What happens when a negative and positive charge are close together?
What happens when a negative and negative charge are close together?
Which particles are free to move around, electrons or protons?

3. Electric Field Analogy
The electric field is the space around an electrical charge
just like
a gravitational field is the space around a mass.

4. Electric Field
Space around a charge.

5. Electric Field Patterns

6. Electric Force
The Force of Electric charges are determined by the type of charge of the objects.
unlike charges attract
like charges repel

7. Charge The symbol for charge is q It can be positive or negative
The charge of something is measured in coulombs

8. Coulomb’s law The magnitude of the force between 2 equal sized objects
K=9x109 N m2/C2

9. Gravity
How does coulombs law compare to the universal law of gravitation?

10. Ex 1
Two balloons are charged with an identical quantity and type of charge: -6.25x10-9 C. They are held apart at a separation distance of m. Determine the magnitude of the electrical force of repulsion between them.

11. Ex 2
Two balloons with charges of x 10-6 C and x 10-6 C attract each other with a force of Newton. Determine the separation distance between the two balloons.