1. 2049 Charge - Electric Field CH 23
Dr. Jeffrey B. Bindell
2049
Welcome to 2049
9/18/2018
2049 Charge - Electric Field CH 23

2. Class Meets Monday, Wednesday, Friday 9:30-10:20 AM
9/18/2018
2049 Charge - Electric Field CH 23

3. 2049 Charge - Electric Field CH 23
Textbook Physics for Engineers and Scientists Volume II (Electricity and Magnetism) Serway & Jewitt Thompson – Brooks/Cole (2004)
9/18/2018
2049 Charge - Electric Field CH 23

4. General Information
Instructor: Dr. Jeffrey Bindell Schedule M,W,F 9:30 AM to 10:20 AM Room 359 Phone Website:
OFFICE HOURS: M,W,F 7:30-9:30 AM
11:30-12:30 (Pot Luck)
MAP-417
9/18/2018
2049 Charge - Electric Field CH 23

5. 2049 Charge - Electric Field CH 23
This is a
HARD
Course!
Reminder
9/18/2018
2049 Charge - Electric Field CH 23

6. 2049 Charge - Electric Field CH 23
Grades
Item
Weight
Mid Semester Examinations
45%
Final Examination
30%
Homework
15%
In Class Quizzes
10%
9/18/2018
2049 Charge - Electric Field CH 23

7. 2049 Charge - Electric Field CH 23
Homework
It is important to notice that homework counts for 15% of your grade. Homeworks will be based on WebAssign. Although “extensions” will be available, valid reasons should be offered at the time or he request.
There will be one or two assignments per chapter. Each assignment will contain between 5 and 12 problems (usually). You must complete the assignment before the due time or you must request an extension. You will need a reason.
9/18/2018
2049 Charge - Electric Field CH 23

8. 2049 Charge - Electric Field CH 23
No Curve
SCORE
GRADE
85-100 A
75-84 B
60-74 C
50-59 D
Less than 50 F
9/18/2018
2049 Charge - Electric Field CH 23

9. Approximate Exam Schedule
EXAM NUMBER
DATE 1
1/27 2
2/10 4
3/31
FINAL EXAM
5/1
9/18/2018
2049 Charge - Electric Field CH 23

10. 2049 Charge - Electric Field CH 23
TENTATIVE
PHY 2049
WEEK
DATE
MON
WED
FRI 1
9-Jan
23: Charge and E Field 2
16-Jan
HOLIDAY
24: Gauss's Law 3
23-Jan
EXAM #1 (23&24) 4
30-Jan
25: Electric Potential 5
6-Feb
26: Capacitence - Dia. 6
13-Feb
27: Current & Reisitance 7
20-Feb
EXAM #2 (25-27)
28: DC Circuits 8
27-Feb
29: Magnetic Field 9
6-Mar
30: Sources of B 10
13-Mar
BREAK 11
20-Mar
31: Faraday's Law 12
27-Mar
32: Inductance
EXAM #4 (28-31) 13
3-Apr
33: AC Circuits 14
10-Apr
34:EM Fields 15
17-Apr
37: Light Topics 16
24-Apr
No Class
FINAL EXAM 17
1-May
9/18/2018
2049 Charge - Electric Field CH 23

11. 2049 Charge - Electric Field CH 23
WebAssign
You need to purchase a WebAssign login either from the bookstore or from the WebAssign website (with credit card).
For your first contact with WebAssign, go to:
Follow the guides to purchase a registration or to Login. The left side of the page has a scroll down menu that should get you where you need to get.
Be sure to bookmark the final login screen because you will be using it quite a bit (I hope).
Your login ID is your PIN with (or possibly without) the leading “0” and without any letters from your first name. Your password has been set to “ihatephysics”. After a successful login, be sure to change your password to something else to protect the privacy of your account.
9/18/2018
2049 Charge - Electric Field CH 23

12. 2049 Charge - Electric Field CH 23
ratemyprofessors.com
Completely unforgiving. Unhelpful office hours from which you leave more confused and with more questions than you came with. Seems to have no time for students, will not listen to any excuse, reasonable or not. Do not be 1 minute late on quiz day. Family emergency, car trouble= unforgivable sin
Very difficult. Not in a tough way, but in an unhelpful way. Does not go over problems and his office hours are not helpful at all. You leave just as confused. Does not go over tests. 
9/18/2018
2049 Charge - Electric Field CH 23

13. 2049 Charge - Electric Field CH 23
ratemyprofessors.com
Waiting for grades to come in. Have no idea if I passes or failed. Tests are UNFAIR, GRADING IS UNFAIR. I didn't miss more than a day of class. This class is an experiment and I don't like being the guinea pig when my GPA is on the line. Something better give or EVERYONE in the class will fail. 
This was a SCALE-UP Course
9/18/2018
2049 Charge - Electric Field CH 23

14. 2049 Charge - Electric Field CH 23
ratemyprofessors.com
this class sucks, but bindell makes it doable. He answers ?'s, speaks clearly, and is pretty funny too. Fair tests and decent curves for the final grade. Do your webassign and make yourself known, you will pass this class... 
Very hard class.Tests consist of 1 homework problem and 2 unseen problems, one easy, one hard.If you go to office hours(if you can get him on a day he's there)he will usually give you extra points on tests that TA's graded unfairly. He also curves the grades a lot.I was looking at a C and made an A 
9/18/2018
2049 Charge - Electric Field CH 23

15. 2049 Charge - Electric Field CH 23
ratemyprofessors.com
Tough class. Bindell is a funny guy and does a pretty good job teaching. Just make sure that you study and don't fall behind. 
Physics II is hard, no doubting that. But Jeff is by far a VERY reasonable professor. Speaks clearly, reasonable weekly quizzes, very flexible with webassigns, and wants the class to do well. Here is something I learned the hard way: STUDY HARD FOR THE TESTS, IF YOU DO NOT, YOU WILL FAIL THEM. PERIOD. 
It is men like this that keep UCF from being considered an elite public uninversity. The man is comepletely and utterly ingorant of how to convey a concept to another human being. He wont answer questions. His tests are not representative of the material. He will show you reviews such as this and refute them. Don't listen. Get out at all costs. 
9/18/2018
2049 Charge - Electric Field CH 23

16. The Facts … Spring ‘05
F includes people who forgot to withdraw and just stopped attending.
9/18/2018
2049 Charge - Electric Field CH 23

17. 2049 Charge - Electric Field CH 23
What I learned:
Students don’t like lectures, especially PowerPoint.
Students don’t like WebAssign
Some problems too hard
Some problems are not coded correctly by WA.
Students don’t like tests unless they are easy.
They’re NOT!
Course is hard, why would tests be easy???
9/18/2018
2049 Charge - Electric Field CH 23

18. 2049 Charge - Electric Field CH 23
My gripes ….
Students study at the last minute.
Students have big holes in their math skills:
Interpreting Graphs.
Using Calculus.
Students come to my office expecting me to solve their homework problems.
I will always help … I will not give you the answers!
Work on the problems before you come for help.
9/18/2018
2049 Charge - Electric Field CH 23

19. 2049 Charge - Electric Field CH 23
How to get an A.
STUDY !
9/18/2018
2049 Charge - Electric Field CH 23

20. 2049 Charge - Electric Field CH 23
Let’s get started …
There is a WebAssignment on board. Be sure to register so you can get started.
Read the beginning of chapter 23.
Deals with charge, Coulomb’s Law and the Electric Field.
There will probably be a quiz on Friday. We’ll see on Wednesday.
I NEVER give POP quizzes. There will always be warnings.
9/18/2018
2049 Charge - Electric Field CH 23

21. 2049 Charge - Electric Field CH 23
Quizzes
Usually one per week except when there is a holiday or a regular examination.
Scored on a scale of I will not count your lowest quiz grade.
Quizzes are usually (but not always) repeats of homework problems or problems that I review in class.
9/18/2018
2049 Charge - Electric Field CH 23

22. 2049 Charge - Electric Field CH 23
Electricity
9/18/2018
2049 Charge - Electric Field CH 23

23. Don’t Mess With Mother Nature St. Elmo’s Fire
Top of Mast
9/18/2018
2049 Charge - Electric Field CH 23

24. 2049 Charge - Electric Field CH 23
A Quick Experiment
9/18/2018
2049 Charge - Electric Field CH 23

25. 2049 Charge - Electric Field CH 23
Idiot!
If lightening had actually traveled down the kite string, old Ben Franklin would have been toast!
9/18/2018
2049 Charge - Electric Field CH 23

26. 2049 Charge - Electric Field CH 23
History
600 BC
Thales of Miletos rubs amber (electron in Greek) with cat fur and uses it to pick up feathers.
Important questions:
Why was he doing this?
Didn’t he have a job??
What happened to the skinned cat?
9/18/2018
2049 Charge - Electric Field CH 23

27. 2049 Charge - Electric Field CH 23
Amber
Million years ago large stands of forests in some parts of the world began to seep globs of sticky resin! This aromatic resin oozed down the sides of trees, as well as filling internal fissures, trapping debris, such as seeds, leaves, feathers and insects. As geologic time progressed the forests were buried and the resin hardened into a soft, warm, golden gem, known as amber. Amber is the fossilized resin of ancient trees which forms through a natural polymerization of the original organic compounds. Most of the world's amber is in the range of million years old.
9/18/2018
2049 Charge - Electric Field CH 23

28. 2049 Charge - Electric Field CH 23
Rubbings
Demo ....
9/18/2018
2049 Charge - Electric Field CH 23

29. 2049 Charge - Electric Field CH 23
Brief Summary
9/18/2018
2049 Charge - Electric Field CH 23

30. 2049 Charge - Electric Field CH 23
Photo
Volunteer Needed
Must be Insured!
9/18/2018
2049 Charge - Electric Field CH 23

31. 2049 Charge - Electric Field CH 23
9/18/2018
2049 Charge - Electric Field CH 23

32. 2049 Charge - Electric Field CH 23
What’s Going On?
All of these effects involve rubbing two surfaces together.
Or pulling two surfaces apart.
Something is on each of these objects.
We call this “something” CHARGE.
9/18/2018
2049 Charge - Electric Field CH 23

33. We have also observed that there must be TWO kinds of charge.
Call these two types
positive (+)
negative(-)
We “define” the charge that winds up on the rubber rod when rubbed by the dead cat to be NEGATIVE.
The charge on the glass rod or the dead cat is defined as POSITIVE.
9/18/2018
2049 Charge - Electric Field CH 23

34. What happens when two surfaces touch or rub?
Bonding!
9/18/2018
2049 Charge - Electric Field CH 23

35. 2049 Charge - Electric Field CH 23
Example - Tape
9/18/2018
2049 Charge - Electric Field CH 23

36. 2049 Charge - Electric Field CH 23
The Balloon (Charged)
Wall
9/18/2018
2049 Charge - Electric Field CH 23

37. 2049 Charge - Electric Field CH 23
9/18/2018
2049 Charge - Electric Field CH 23

38. 2049 Charge - Electric Field CH 23
The Triboelectric Series
When two of the following materials are rubbed together under ordinary circumstances, the top listed material becomes positively charged and the lower listed material becomes negatively charged. MORE POSITIVE rabbit's fur glass mica nylon wool cat's fur silk paper cotton wood acrylic cellophane tape polystyrene polyethylene rubber balloon saran wrap MORE NEGATIVE
No! No!
No! No!
9/18/2018
2049 Charge - Electric Field CH 23

39. 2049 Charge - Electric Field CH 23
What have we found?
There are TWO types of charge.
Positive
Negative
Like Charges Attract
Un-Like charges repel
The force between charges increases as they are brought closer together.
This charge separation results from chemical bonds which are severed in the process.
9/18/2018
2049 Charge - Electric Field CH 23

40. Forces Between ChargesQ1 Q2
Attract
Repel + X -
9/18/2018
2049 Charge - Electric Field CH 23

41. 2049 Charge - Electric Field CH 23
Types of Materials
Insulators
Holds a charge
Conductors
Allows charge to easily move (current)
Semiconductors (Si, Ge, C …)
Somewhere in the middle, very temperature and impurity sensitive.
Used for transistors and optical devices such as LEDs and Semiconductor Lasers.
Semi-Metals
Don’t ask!
9/18/2018
2049 Charge - Electric Field CH 23

42. Charles Augustin de Coulomb (1736 - 1806)
9/18/2018
2049 Charge - Electric Field CH 23

43. Coulomb’s Law The Unit of Charge is called THE COULOMB
Smallest Charge: e ( a positive number)
1.6 x Coul.
electron charge = -e
Proton charge = +e
9/18/2018
2049 Charge - Electric Field CH 23