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Lecture: 14 (iq14)

1. What is gravitational potential energy (difference)?

a. Energy build up: Work against gravity

b. Energy released: Work by gravity

2. Electric potential energy, and electric potential. Here after: “electric” will be omitted.

3. From electric potential to electric field.

4. Potential near a point charge. E = - dV/dr = ^….

5. V(r) for a uniformly charged plastic shell. (Read: p681, Fig17.26, plastic shell + plastic disk)

Announcement:

o Midterm1: Class average 70. One perfect score. See me for one-on-one help.

o Office hours: MWF 9:15-10:15. Other time by appointment.