Physics 253 - Fall 2005 Call # 05477 Syllabus Instructor: Dr. Daniel Phillips Text: Physics for Scientists and Engineers Office: 242B Clippinger Laboratory Paul A. Tipler, Gene Mosca e-mail: phillips@phy.ohiou.edu 5 th edition 2004 Phone: 593-1698 Office Hrs: 9 a.m.-10 a.m. Monday, Wednesday, and Friday, and by appointment This syllabus and additional information about the course can be found at http://loncapa.phy.ohiou.edu, click on the PHYS253 button. The following list of chapters will be covered on approximately the days indicated. Sep 7 Introduction and Review of Chapters 21-22 8 Chapter 23, Electric potential 9 Chapter 23 Sep 12 Chapter 23 14 Chapter 24, Electrostatic energy 15 Quiz 1, CAPA 1 due 16 Chapter 24 Sep 19 Chapter 25, Electric Current & DC circuits 21 Chapter 25 22 Quiz 2, CAPA 2 due 23 Chapter 25 Sep 26 Chapter 26, Magnetic Field 28 Chapter 26 29 Quiz 3, CAPA 3 due 30 Chapter 26 Oct 3 Chapter 27, Sources of Magnetic Field 5 Chapter 27 6 Quiz 4, CAPA 4 due 7 Chapter 28, Magnetic Induction Oct 10 Chapter 28 12 No class 13 Chapter 28, CAPA 5 due 14 Chapter 29, AC Circuits 29-1, 29-2, 29-7 Oct 17 Chapter 29 19 Chapter 30, Maxwell's Equations 20 Quiz 5, CAPA 6 due 21 Chapter 30 Oct 24 Chapter 31, Properties of Light 26 Chapter 31 27 Chapter 31 28 Quiz 6, CAPA 7 due Oct 31 Chapter 32 Optical Images Nov 2 Chapter 32 3 Chapter 32 4 Quiz 7, CAPA 8 due Nov 7 Chapter 33, Interference and Diffraction 8 Chapter 33 10 Chapter 33 11 Veterans Day, OU Closed Nov 14 Quiz 8, CAPA 9 due 16 Review Midterm exam will be at 7:00 p.m. on Tuesday, October 11 th. Final Exam will be at 10:10 am on Tuesday, November 22 nd.
General Physics is about asking questions: Why is the sky blue?, Why does the Sun shine?, What causes apples to fall to the ground?. In this course we will ask questions about the behavior of electricity and magnetism, including, but not limited to, Why does electric current flow?, How are magnetic fields produced?, and What is light?. But Physics is not just about the answers to these questions, interesting though they are. It is about the process by which we arrive at those answers. I hope that while taking the 250- sequence you will begin to see how physicists break down and analyze problems: whether they are big problems like the ones listed in the previous paragraph, or smaller questions like the ones you'll be doing each week. These questions will often feature illustrations or wording that may at first sight make you think you cannot solve the problem but this is not so, or at least it shouldn't be. The problems will be designed so that you have to think like a physicist, in other words, break down the problem into smaller pieces, so that you can use the information you're given to get to the answer you've been asked for. Consequently, memorizing formulas will be somewhat helpful, but will not mean you can solve all the problems we set. You will not be able to pass on memory alone. More important than remembering the formulas you'll see in this course will be being able to apply them. Physics 253 deals with electric potential, electric capacitors, the flow of electricity & electrical circuits, magnetic fields, magnetic induction, electromagnetic waves, reflection and refraction, optical images, and interference & diffraction. It is the third of a four-quarter sequence in General Physics for students of science and engineering. Lectures: reading and attendance My goal in the lectures is to explain and supplement the material presented in the textbook. This means I will assume that you have read the sections of the book we re discussing on any given day before you come to that day s lecture. I will not go through the book line by line, rehashing what s already written out by Tipler and Mosca. Instead, I ll provide a general overview of the material in a particular section, flesh out any derivations I think are particularly important, explain things that may not be so clear in the textbook, and then proceed to solve some problems related to the section(s) under consideration that day. This will work best if you tell me what you found difficult when you did the reading before class. That way I can attempt to help you understand it. At the end of each class I ll announce the sections you should read in preparation for our next meeting. Attendance is not mandatory, but it is encouraged. I realize it is not much fun to get up and come to a lecture at 8 am. I don t really like it either. But, I will try to say stuff in the lectures that is genuinely helpful in terms of your understanding the material and solving the problems for this course. 2
I will not be taking a roll but if you miss a class you should remember that you are responsible for knowing all material covered in class and all information passed on there whether you came to class or not. Also remember that a University Excuse (see Ohio University Handbook) is required for any makeups on quizzes, exams or lab work. If you know beforehand that you will miss a class, the best thing to do is to let me know by email, and then I can tell you what you will miss. An exceptional student will be able to do well in this class simply by reading the book. An exceptional student will probably also be able to do well in the class just by listening to the lectures. But most people will need to read the book and come to the lectures if they want to succeed. Background It is assumed that you have previously taken the first course of the series, Physics 251, which deals with Newtonian mechanics, rotational dynamics and gravitation. Since you have taken and passed Physics 251 and 252 knowledge learnt in that course will be used in solving some of the problems set for Physics 253. Students taking Physics 253 have passed MATH 263A and B and Physics 251 and 252, or the equivalent courses elsewhere. So you are expected to be familiar with the following topics: Algebra of single and multiple variable equations Graphical representation of equations Solution of simultaneous equations with 2 or 3 variables Trigonometric functions, their definitions, properties and associated identities Logarithmic and exponential function properties Differentiation and integration of simple functions, e.g. x, x 2, x -1/2, sin x Simple line and surface integration Vector addition and subtraction Vector multiplication: dot and cross products Motion of particles and solid objects Conservation of energy and momentum Wave mechanics and simple harmonic motion Heat and thermodynamics Electric Force and Field Quizzes and Exams No books, notes or formulae stored in electronic or written form may be consulted during the quizzes or exams. Students are expected to remember basic formulae and definitions. A formula sheet will be provided with the exams by the instructor and will also be available at the class web site. Students will need a simple and cheap "scientific" calculator such as the TI 30 X. The particular functions you will require are: the trig. functions sin, cos and tan and their inverses; log; square root; scientific notation; exponential. Students who have not used 3
a scientific calculator before should make sure they are familiar with how to perform long calculations as well as use the above functions. You do not need to buy an elaborate programmable calculator just for this course. However, any calculator from the TI 80 series family will be allowed, but, if you do use any advanced features of your calculator you must record that in your solution e.g. solution of quadratic equation, solution of sets of linear equations, numerical integration, regression analysis. Also, remember, consulting formulae or notes stored in a calculator is considered cheating for the purposes of the exams and quizzes, just like using written notes or a book. During exams and quizzes we will do random checks of calculators to ensure that no formulas, notes or equations are stored that are relevant to the quiz or exam being taken and could give an unfair advantage. Penalties for storing such information may range from the student being required to delete the information immediately, to being given zero for the quiz or exam, or to failure for the entire course. No calculator or electronic device may be used that has a high capacity storage device e.g. a hard drive, CD or ZIP drive, or one which has the ability for wireless communication, e.g. Palm Pilots. Midterm exam There will be one two-hour midterm exam that will count 20% towards your overall grade. Final Exam The final exam will be comprehensive and will be two hours long. It will count 25% towards your overall grade. Quizzes Quizzes will usually be given during the classes on Thursdays (but later quizzes will be exceptions, see the schedule at the beginning of this document). There will be two types of quizzes given, group quizzes and individual quizzes. Each quiz will take 20-25 minutes. For group quizzes you will be put in groups of 3-5 students. Each group will appoint a person as the writer for that group. That person will be given paper to record the names of the students in the group and the group response to the question. The second type of quiz, the individual quiz, will be given to each student. They will complete this quiz by themselves and turn it in after the allotted time. For both the group and individual quizzes you must explain fully how you arrived at your solution. Your graders are not psychic. Textbooks, notes or other materials may not be consulted during work on either part of the quiz. For the group quiz quiet discussion of the solution is expected between members of the group. The group may ask questions of the TA who will respond only with suggestions on how to complete the solution. The TA will not give direct answers to the solution. If you miss a class where quizzes are given you will get a zero (0) for both the group and individual quiz that day, unless you have a valid University excuse. Oversleeping is not an excuse for missing any of the weekly quizzes. If you need to attend a University-sponsored event during one of our quiz times please let me know as soon as possible and we will make alternative arrangements for you to take that quiz. 4
The total quiz grade will count 20% towards your overall grade. This 20% will be split equally between the two types of quizzes. At the end of the quarter your quiz score is based only on your seven best individual quiz scores and your seven best group quiz scores. In other words, you get to drop your worst score in each category. You may also make up one (1) individual or group quiz score by substituting a written assignment for it. Quiz make-up-written chapter summary: The assignment is to write a summary of any Chapter of the Tipler/Mosca book that we cover this quarter. The summary should be no more than three (3) pages long, should be in complete sentences (i.e. it should not be done as a bulleted list), and should not be copied straight from the book s Summary at the end of the chapter you choose. It must be legibly handwritten. The goal of the summary is to demonstrate that you understand the material in that chapter: the most relevant formulae and how they are connected to one another. I will grade the summary based on how well I think you have achieved this goal. If you are tempted to copy your summary from another student you should read the Cheating section elsewhere in this syllabus. I will give you a zero for your chapter summary if it bears an uncanny resemblance to the summary handed in by anyone else, or if it reads exactly the same as the summary at the end of a Tipler/Mosca chapter. If you wish to write a summary of a Tipler/Mosca chapter in order to redeem one of your quiz grades you must turn the summary in to me by 5 pm on Thursday, November 10. I will only accept hard copies of the summaries. Unless you tell me otherwise I will use the score you get on the summary to replace your lowest quiz score. (I will not use the summary score to replace your quiz score if you end up doing worse on the summary than you did on your worst quiz.) 5
Homework Assignments Personalized sets of homework will be provided to each student throughout the quarter. These problems are to be completed and graded through our Learning On-Line Computer Assisted Personalized Assignment (LON-CAPA) system. Students can enter their answers in a computer terminal and get them graded immediately on the screen. A student can try each problem up to 10 times. Each set has a due date and time assigned at the top of the page. You will access your assignments via the World Wide Web (WWW). The address is http://loncapa.phy.ohiou.edu,. You need to enter your Oak login id and your password to log onto this computer system. Please report any problems with access to me as soon as possible. Once you login to the system a second browser window will open up with a remote control similar to the one on the right. This will be your main navigation tool. If this window does not appear, exit your browser and log in again. To access your assignment after you have logged in select the Student role in your particular course. You will be presented with the course home page. Click on NAV. Scroll to the current assignment and click on the problem. Problems are color-coded, and if the assignment is open, the due date is listed on the same line. Green indicates the problem has been completed. Light green indicates the problem has multiple parts (see parts of for solved status). Yellow means the problem is open. Bright yellow indicates it is due in the next 24 hours, and pink indicates the problem is closed (answers may be available). Enter the answers in the boxes provided (or via pull-down menus). Press submit answer to send the answer to the computer. Feedback will be provided. Read this carefully. If you are correct, you will be provided with a receipt number. RECORD THIS NUMBER! If there is a technical problem, this number will provide proof that you have done your assignment. You are allowed multiple attempts at a problem. The number of attempts is displayed below the problem and in the navigation page. To obtain a printout of your assignment, go to one of the problems in the assignment. Select PRT on the remote. To print the assignment, select The whole primary sequence. You can then select 1 or 2 column output and portrait (use other options at your own risk!). Press submit. The system will create a.pdf file (Adobe Portable Document Format), which can be read, and then printed, using Adobe Acroread. The screen version is pretty ugly, but the print version should look much better. 6
WARNING! CAPA will stop accepting answers at the exact due time listed on the assignment. The time on the computer is NOT necessarily the time on your watch. Waiting to the last hour to do your assignment is not suggested. Additionally, the computer load can get pretty high at due times. Do not wait until the last minute! Here are a few tips when entering answers: 1. Keep a notebook with your solutions written out in it. 2. Keep a list of your answers! When you get to the 7 th or 8 th try on a problem, you can easily confuse yourself as to what you ve attempted so far. 3. Read the computer feeback carefully! 4. Scientific notation is entered in the form 6.02E23 not 6.02 x 10 23 Browsers: The following browsers should work with LON-CAPA: Netscape 3, 4, or 6, Internet Explorer 4, 5, or 6. Your browser will need to have "cookies", "Javascript" and "Java" enabled. HELP!!! If you are having technical difficulties checkout http://loncapa.phy.ohiou.edu/help. If that does not fix it please e-mail me, phillips@phy.ohiou.edu. Include the browser version, location, a brief description of the problem and any error messages you have seen. If you wish to do so you may turn in hand written answers to the homework. These will be due at the same time as the Assignment but you will be given only one chance to get it right. So you are strongly encouraged to use the Web to enter their solutions. Since the TAs for this course have no homework to grade there will be extended hours for students to consult with TAs for help. However TAs will not do the problems for you. They will help you get to a position where they can do the problem for themselves. The homework help times and places will be announced in class. If you find you get the right answer but do not know why your answer is correct please come and see me, or one of the TAs. Please bring your solution with you so we can have a concrete discussion. The purpose of the homework is to encourage you to regularly study the material and to learn how to solve the problems correctly. If you just get the correct answer by picking an equation out of the book or copying the right equation from a friend you will not be able to answer similar questions on exams or quizzes. In those settings you will be required to explain or somehow use the physics principles that underlie the equation. We expect you to collaborate with others during your solution of the homework but if you do not understand why an answer is the correct one please come and ask. The homework will count 15% toward the final grade. The average grade on the homework is approximately 90%. There is a small correlation between the home work grade and your overall grade for the course, but the main purpose of the homework is to help you learn the material in preparation for the exams 7
Laboratory You are required to register for a laboratory for this class. A passing grade on the laboratory of at least 70% is required in order to pass the course. A missed lab without a valid university excuse counts as zero and cannot be made up. Only labs for which you have a valid university excuse can be made up by scheduling the make up through the curators office (042 Clippinger). Where possible labs should be made up during the week in which they were due to be taken. Students waiting until the last weeks of the quarter to make up labs missed in the first part of the quarter will be denied make up privileges even if the original excuse for the missing lab was valid. Not only must the lab be passed to pass the entire course, but if a student misses more than 2 labs without a valid University excuse then the lab will be failed as well as the entire course. The laboratory counts 20% towards the final grade. The average grade on the laboratory is ~90%. There is a small correlation between the laboratory grade and your overall grade for the course. However, like the homework, it is there to help you learn the material and to teach you how to obtain data in an experiment, keep a lab. note book and prepare a technical report. If you already took PHYS 253 and you passed the laboratory you may be able to obtain credit for this part of the course. However, in order to obtain credit for the laboratory in this way you must come and see me. If we get to the end of the course and I only find out then that you have not attended the laboratory you will get 0 for the laboratory and consequently fail the course. Cheating Students suspected of cheating will be warned and may be asked to change seats during exams or quizzes, take a retest or may be asked to resubmit the work in the case of laboratory reports or Chapter summaries. This is not an indication that cheating has actually occurred, but is a preventive measure to reduce the chances of cheating in suspicious circumstances. Students caught cheating may be given an F for the course. If the student does not agree with this action, the student may file a grievance through established University channels. The instructor may also initiate a review by the University Judicial Board. This action could result in suspension of the student or other punitive actions by the Judicial Board. The value of a degree from Ohio University is largely determined by the strength of the reputation we all have. Academic dishonesty will not be tolerated. 8
Grading Ultimately a numerical score will be used to determine your grade, but below I've written some of what I expect students in particular grade letter bands to be capable of when they complete this course. An A student will be able to solve correctly problems involving: electric potential; electric capacitors; d.c., a.c., and transient response of resistors, capacitors and inductors; d.c. and a.c. circuits, magnetism and magnetic fields; magnetic induction; electromagnetic waves, polarization, reflection and refraction of light waves; geometric optics; interference and diffraction. A B student will be able to solve problems in almost all the areas but make minor mistakes and be unable to solve problems in one major area. A C student will be able to answer most or all of the shorter problems in all areas correctly or with only minor mistakes but will have difficulties with the longer problems through missing key steps or failing to use the correct principles. A D student will be get some parts to many problems correct but find it difficult to complete correctly any of the longer problems on the exam. Parts of problems that are correct will probably be not explained, diagrams will be missing as will statements regarding the physical principles used. To get an F in this course a student will have had severe difficulties with the material of the course in all areas. They will probably have been unable to complete the suggested problems or homework without extensive use of the textbook or other assistance. The individual numerical scores will be weighted as given above and added to give a total score out of 100. Letter grades will be awarded approximately as follows: A- to A 90 and above; B- to B+ 80 to 89; C- to C+ 70 to 79; D- to D+ 60 to 69; F below 60. The bands may be adjusted down but they will never be adjusted up. No letter grades are applied to individual parts of the course: the numerical scores from the parts, with the weightings shown, are used to calculate the final letter grade for the course. You should also be aware that most students score about 90% labs, and many get a similar score on quizzes, this means that most of the spread or dispersion in the grades is determined by the exams. It also means that even if you are doing well on CAPA and on the Labs that will probably not be enough to ensure that you do well in the course overall. 9
Physics 253 Laboratory Schedule Fall 2005-6 Week of: Experiment # Sept. 5 NO LABS THIS WEEK -- Sept. 12 Deflection of an Electron Beam 24 Sept. 19 Capacitors and Electrostatics 46 Sept. 26 Ohm s Law 25 Oct. 3 Wheatstone's Bridge 27 Oct. 10 e/m by the Busch Tube Method 41* (Technical Report) Oct. 17 Magnetic Fields 32 Oct. 24 Plane Mirrors and Index of Refraction 48 Oct. 31 Thin Lenses 36 Nov. 7 NO LABS -- *Technical Report is due the week of Oct. 24th in your laboratory. It is worth 30% of the total lab grade. 1. See 250 Series Laboratory Experiment Book page 11 and 12 (in Introduction) for information about how to write Lab and Technical reports. Before each lab, read all of the expected measurements and procedures and then write the "Statement of Purpose of the Experiment" (see page 11 in lab manual) in your lab book before coming to lab. 2. Missed labs and/or lab reports shall count as zero (0). If more than two (2) labs and/or reports are missed with or without a University sanctioned excuse (and not made up in the case of a University excuse) you will fail the entire course. Read the Physics Department Laboratory Makeup Policy posted on the door of the laboratory. You are responsible for this information. 3. In case of academic dishonesty (copying, plagiarism, etc., including material from the previous quarters) the grade on the lab report may result in a zero (0). If this occurs on the technical report, you may fail the lab and hence the entire course since your total lab grade may now fall below 70%. 4. For each weekday (Monday-Friday) a report is late, without excuse, one (1) point will be subtracted from the report grade. A 70% grade in lab is required to pass the lab course. **Bring your calculator and ruler/protractor to lab. 10