1. Finding the Potential from the Electric Field
The potential difference between two points in space is
where s is the position along a line from point i to point f. That is, we can find the potential difference between two points if we know the electric field.
We can think of an integral as an area under a curve. Thus a graphical interpretation of the equation above is

2. EXAMPLE 30.2 The potential of a parallel-plate capacitor

3. EXAMPLE 30.2 The potential of a parallel-plate capacitor

4. EXAMPLE 30.2 The potential of a parallel-plate capacitor

7. Finding the Electric Field from the Potential
In terms of the potential, the component of the electric field in the s-direction is
Now we have reversed Equation 30.3 and have a way to find the electric field from the potential.

8. EXAMPLE 30.4 Finding E from the slope of V
QUESTION:

9. EXAMPLE 30.4 Finding E from the slope of V

12. Exam 1 Review Test bank of problems for exam are posted on schedule
There will be conceptual questions
Conceptual questions from the end of chapters 26-30
Solutions will be posted by Friday-Saturday
# in problems will be different
Same grading as HW

13. Group Problems Start Ch 29 and Ch 30 HW
HW is due SUNDAY night – not Monday night!!!!