1. How can charges exert forces without touching?
Electric Forces are really created by electric FIELDS that are always present around charges
Electric Field: a region around a charge that an electric force would act

2. Compare the charge on each particle creating the electric fields shown below.
+2Q Q

3. Strength of the Electric Field
Shown by density of field lines (how close they are together)
The closer the lines, the stronger the field!

4. Direction of the Electric Field
Shown with Arrows
Shows direction that a _____ test charge would move +

5. Electric Field (E)
Unit: N/C
Depends on only 1 charge: the charge creating the electric field r q1

6. Electric Field and Electric Force
Connecting
Electric Field and Electric Force

7. q experiences a force when placed in the electric field
Force on a Charge in an Electric Field
q experiences a force when placed in the electric field

8. a. What is the magnitude and direction of the electric field at point P?
b. If you put an electron at point P, how much force would the electron feel? In what direction?
Example Problem

9. Electric Fields