1. Chapter 23: Electric Fields
The coulomb or electric force
The electric field vector

2. Example Problem 23.11
Review problem. In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is 0.529x10-10 m. (a) Find the electric force between the two. (b) If this causes the centripetal acceleration of the electron, what is the speed of the electron?

3. Example Problem 23.22 Example Problem 23.13
What are the magnitude and direction of the electric field that will balance the weight of (a) an electron and (b) a proton?
Example Problem 23.22
For the electric dipole, show that the electric field at a distant point on the +x axis is

4. Example Problem 23.17
Three point charges are at the corners of an equilateral triangle as shown. Calculate the electric field at the position of the 2.00 C charge due to the other two charges.

5. Electric Field Lines
Field lines of a positive point charge

6. Two point charges

7. Continuous Charge Distributions

8. Example Problem 23.35
A thin rod of length l and uniform linear charge density  lies along the x axis. (a) Show that the electric field a distance y from the rod along its perpendicular bisector, has no x component and is given by E=2kesin0/y. (b) Using this result show that the field of a rod of infinite length is E=2ke/y. 0