This assignment is due before 9 AM, Friday, August 30^th, 2007.

Please type a nickname: (in case your answer gets used in class).

Prior to answering the questions, you might want a little more experience with electric fields.

• The following link gives the wind velocity vector field for San Francisco Bay. Click on the "Streaklines" to see the map in motion (requires JAVA) on your computer.
• The notion of an electric field is similar, except that only charged particles (instead of air particles, dust, etc) respond to electric fields. The following link provides some short movies of electric fields due to a particle source and a particle sink. Click on the image to play the movie.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT HOMEWORK button at the bottom of this page.

WarmUps are worth 4 points

1.

1. Inside a perfect conductor, the electric field must be zero.
2. No excess charge can exist inside a perfect conductor.
3. All of the excess charge on a perfect conductor must be located at the surfaces.
4. The flux through an arbitrary closed surface equals the charge enclosed by the surface divided by ₀. (Gauss's law)

2.

3.

a) A hollow sphere with a uniform volume charge density

b) An infinitely long solid cylinder with a charge density that varies with radius

c) A solid conducting sphere with a total charge of 5 microcoulombs

d) An infinitely long solid cylinder with a charge density that varies along the length

e) A solid conducting cube with a total charge of 5 microcoulombs

f) both d) and e)

g) both c) and e)

You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.