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
Force => work => change in K=> change in Potential energy
ΔU = Uf – Ui = -W = - ΔK
Work done is path independent. K+U = constant.
U = k q1 q2/r

4. PHY 2049: Physics II Electric Potential Also V = U/q = -W/q
Units of Joules/coulomb = volt
1 eV = e x 1V = 1.6 x J
Also
V = kq/r
Vf –Vi = -∫E.ds
Add as a number

5. PHY 2049: Physics II

6. PHY 2049: Physics II Rank them by the magnitude of electric field
Which has the field pointed to the right
What does an electron do when released midway

7.     
PHY 2049: Physics II

8. PHY 2049: Physics II Vf-Vi = -∫ k q/r2 dr Choose Vi = V (∞)=0
V(r) = kq/r

9. PHY 2049: Physics II

10. Uniformly charged disk
V = kpcosθ/r2
E = -∂V/∂s = -
Uniformly charged disk
V = ??

11. A B C
(24 - 6)

12. . P r dq
(24 - 7)

13. dq O A
(24 - 8)

14. (24 - 9)

15. ( )

16. S A B  V q S V
( )

17. ( )

18. ( ) A B V
V+dV

19. ( ) A B V
V+dV

20. ( ) x y O q1 q2 q3
r12
r23
r13

21. O x y  q1 Step 1 (24 - 16) x O r12 q1 q2  Step 2 Step 3 x y O r12

22. ( )
path A B
conductor

23. ( )

24. ( )

25. ( ) R