1. Warm Up Problem -2.0  C 30° 2.0 m Please find x- and y- components of the electric field at the given point, marked x, and the potential at that point

2. Annc. Next quiz on finding electric field and potential associated with 2 points. Will utilize symmetries. New hw to be posted. Review quiz 9 Reflection questions.

3. What about the potential associated with planes of charge? The (practical) assumption is that we have 2 planes of charge, each with opposite charge, but otherwise identical. The negative one we assume is at zero potential. Both sketch and calculate lines of equal potential.

4. What is the potential between the two planes? Remember that the E field is constant in the space between them.

5. Sketch the E field lines and equipotential lines associated with two planes of charge. ++++++++++++++++ --

6. Assume a charge density of +/- 0.1  C per meter squared on each plate. Also, assume the negatively charged plate is at a potential of zero. If the plates are separated by 0.1 mm, what would be the potential on the other plate?

7. More on the parallel plates In the process, find the strength of the electric field between the plates AND find the value of some of the equipotential lines.

8. Summary table electric fields and potential differences generated by each of the following Electric field (N/c or V/m)Potential (V) with respect to a location of zero potential Positive point charge positive line of charge not addressed (but addressable if needed!) Positive plane of charge

9. What if a charge of +0.01  C were placed between the plates? What force would it experience? If the charge happened to be resting on an object with a mass of 1 gram, what would be its acceleration?

10. What happens as you add more charge to each plate?

11. Introduce capacitance associated with two parallel plates.