1. PHY 2049: Physics II
Tutoring Center is open in room NPB 1215, M-F 12:00AM -4:00PM. It is free.
Hopefully all homework problems have been
solved. Please see me immediately after the class if there is still an issue.

2. PHY 2049: Physics II
About bicycle riding: If some one shows you a trick, it means that,
It is possible to do that trick
The person who showed you, can do the trick.
It does not mean that you can do the trick.
Try it a lot of times and you can too.

3. PHY 2049: Physics II What have we learned
Coulomb’s law, electric field, Gauss’ theorem and electric potential.
All comes together in the concept of a capacitor.
Capacitor: A device to store charge.

4. PHY 2049: Physics II

5. PHY 2049: Physics II Calculate the Electric Field at P
Calculate the el. potential at P

6. PHY 2049: Physics II Point charge Distribution of charges
Line charge at an edge
Disc on an axis through the center

7. PHY 2049: Class Quiz
If 500 J of work are required to carry a charged particle between two points with a potential
difference of 20V, the magnitude of the charge on the particle is:
A. 0:040C
B. 12:5C
C. 20C
D. cannot be computed unless the path is given
E. none of these

8. Some old business:
What is the electric field
of a shell
of a uniform spherical charge distribution?
What is the potential for each of the above?

9. PHY 2049: Physics II Some old business
The potential of a uniform spherical charge.
Calculate electric field, integrate it to get the potential E r R V V

10. Two particles with charges Q and -Q are fixed at the vertices of an equilateral triangle with sides of length a. The work required to move a particle with charge q from the other vertex to the center of the line joining the fixed particles is:
A. 0
B. kQq/a
C. kQq/a2
D. 2kQq/a
E. 1.4kQq/a

11. PHY 2049: Physics II a= 39 cm q1 = 3.4pC q2 = 6 pC E at the center?
What is the potential at the center?

12. PHY 2049: Physics II Capacitors: A device to hold charge.
It is held by Coulomb force between the charges. +q and –q on two separate places.
V : potential difference: q= CV
C: capacitance units farad.

13. PHY 2049: Physics II

14. PHY 2049: Physics II