1. Aim: What is an Electric Field
Aim: What is an Electric Field? Do Now: What does the word field mean to you?

2. What is an Electric Field?
A region in space in which an electrostatic force acts on a charge
Exists around every charged object
Mapped by drawing field lines (indicate the direction of the electrostatic force an a + test charge placed in a field.)
It is a vector quantity

3. Equation
Magnitude is equal to the force exerted per unit charge at that point in the electric field.
What does this translate to mathematically?

4. E=F/q Where: E is the magnitude of the electric field
F is the magnitude of the force
q is the magnitude of the charge

5. Units F is measured in Newtons q is measured in Coulomb’s
What will E be measured in then?
F/q = Newtons/Coulomb’s = E

6. What is the magnitude of the electrostatic force experienced by one elementary charge at a point in the electric field where the electric field intensity is 3.0 x 103 N/C?

7. Drawing Electric Field Lines+ A B
Point A is 1 meter from sphere, so E = 9 N/C
Point B is 3 meters from sphere, so E = ?

8. E d Based on your answer from the previous slide, where is E stronger?

9. Charged conducting sphere
inside +

10. Between 2 parallel charged plates B C A
What is E for each point?

11. What is the Relationship between field strength and potential difference?
Do Now: Fill out the scantron for the Winter Break Assignment
HW: Quiz tomorrow on Coulomb’s Law and Electric Fields

12. Charged Particle Behavior +q v
Curved path due to electric field on charged particle
Older TV’s and inkjet printers use this technology

13. Electric Work Existing Electric Field F +q d Fe
If we push a charge opposite the field direction, work is done WE = F·d
Since W = ΔPE, the charge has more potential energy at the final location.

14. Relationship between Electric Field Strength and Electric Potential Difference
V = W/q W = F·d for a constant Force (constant field)
V = F·d/q F/q = E
V = Ed