PHY-112 Electricity, Magnetism, and Waves

Transcription

1 Wabash College Department of Physics PHY-112 Electricity, Magnetism, and Waves Instructor: Dr. Martin John Madsen Semester: Spring Office: Goodrich 309 Office Phone: Office Hours: MWF 9am-11am Discussion Times: MWF 8:00 am 8:50 am Room: Goodrich 104 Lab Times: MT 1:10 pm 4:00pm Introduction This course covers advances in physics through the 19th century including electromagnetism, optics, and wave physics. These may seem like separate subjects, but they are related since they both involve the physics of the continuum, in contrast to the physics of particles covered in Physics 111. Waves involve continuum physics, while electromagnetism describes the interaction of electromagnetic fields (continuum) with electric charges (particles). Furthermore, light is simply an electromagnetic wave. It is impossible to stress the importance of electrodynamics. I will be designing this course to be very interactive so that we can concentrate on the areas where you are having the most difficulty. It is most important for you to tell me what you don t understand so that I can help you figure it out before an exam. There are four learning goals for this course: 1. Internalize a correct conceptual understanding of key ideas in electromagnetism, optics, and wave physics. 2. Correctly apply this conceptual understanding to a number of quantitative problems. 3. Connect these concepts to hands-on experience in the lab. 4. Connect these concepts to ideas and models in your primary field of interest. Learning Physics The course consists of three class discussions plus a three-hour lab period each week. However, most of the work in learning physics happens outside of the classroom. Experience has shown that there are a number of steps you should follow in order to learn new concepts in physics. These are shown in the Physics Learning Circle. I have designed this course to help you navigate through this learning procedure.

2 Phys Read Textbook Finish Homework Re-read Textbook Attempt Homework Physics Learning Circle Correct Workbook Attempt Workbook Reading Quiz Class Discussion Read Textbook Most of the reading will come from the Knight book this semester. However, if you are interested in taking the MCAT, I recommend buying the Physics for Pre-meds book, too. It provides a nice overview of the key ideas. Physics for Scientists and Engineers, (2nd edition), by Randall D. Knight You will need to purchase the Value Pack version of Volume 3 (Chapters 20-25, ISBN: ) and Volume 4 (Chapters 26-37, ISBN: ) that has the Student Workbook bundled with the paperback textbook. Both volumes should be available at the bookstore. In addition, we will be studying material from Chapter 15 on fluids and elasticity. You should have the material from Chapter 15 from your Physics 111 text (For those that did not take Physics 111 in the Fall 2008 semester, I can provide a copy of this material). I>Clicker, (), by You must purchase an I>Clicker classroom response pad (ISBN: ). These will be used every day in class to monitor attendance and to monitor your understanding of the material. Physics for Pre-med, Biology, and Allied health students, (1st edition), by George J. Hademenos This text will serve as a secondary reference for the course. It is a nice guide and covers a couple of topics that appear on the MCAT that we will not cover in class. In addition, there will be various other materials that will be presented for the reading assignments. I will post these on Moodle. Reading Timeline: You should do the reading the day before the lecture. This will give you plenty of time to work through the workbook and take the reading quiz. Approximate time required: 1 hour Attempt Workbook The Student Workbook is designed to be a pre-discussion test of your understanding of the material. The idea is to do the reading and then answer the workbook questions. I know it seems like a lot of un-graded

3 Phys work, but experience has shown that if you do the extra work, you will have a better understanding of the physics. In the end, this will make it much easier to do the homework assignments and to prepare for the exams. You might not get every question prior to class, but you should look through the workbook and attempt the problems. I will periodically award extra credit to students that have completed the workbook pages. Workbook Timeline: The workbook problems should not take more than half an hour. You should attempt them the before trying the reading quiz. Moodle Reading Quiz There will be a reading quiz posted on Moodle a few days before every discussion period. You are responsible for completing the quiz before the discussion period starts. Due to the way that Moodle functions, if you do not complete a Reading Quiz on time, you will recieve a zero score and lose access to that quiz for future study and review. Class Discussion The class period will NOT be devoted to lecture! Rather, it will be primarily spent actively discussing the concepts covered in each reading assignment and analyzing demonstrations. In addition, I will spend time (about the last 10 minutes or so) working though the example homework problem. This will be an opportunity for you to ask questions and practice problem solving together as a class. A complete solution to these problems will be posted on Moodle. The example problem will be posted with the discussion slides, notes, and homework package for the day. Printing these before coming to lecture will give you space to take notes. I will often give hints and suggestions about homework problems, so come prepared to take notes! I>Clickers: You must purchase an I>Clicker for use in classroom discussions. These will be used as the feedback tool for in-class questions and discussion. You can purchase one at the bookstore. You will need to follow the registration instructions given on the first day of class. Your inputs will be recorded both for attendance purposes, as well as for the in-class extra-credit. Attendance: Attending class is essential. Attendance will be taken every day using the I>Clicker. You have three free absences, though I would appreciate it if you would let me know you are going to be gone. You will be responsible for all material covered in class. Every absence after that will be a 3% reduction in your final grade, i.e. if you miss class 5 times, your best grade in the class will be a 94%. Extra Credit: Correct answers to the in-class questions will be worth extra credit on the reading quiz grade. Reading quizzes are typically worth 40 points. Each correct answer recorded by the clicker in class will be worth 2 points on the reading quiz grade, up to 10 points. Correct Workbook After participating in the class discussion, go back and correct any workbook problems you might have missed. The solutions to the workbook will be posted on Moodle after class so you can check your understanding of the concepts. Attempt Homework There are four primary reasons for the homework assignments: 1. To gain a working understanding of abstract physics concepts by applying them to problems.

4 Phys To develop problem solving skills. 3. To test your understanding of the material. If you have difficulty doing the problems, then you do not understand the material. WARNING: The converse is not necessarily true! 4. To connect the models and concepts in physics to similar ideas in chemistry, biology, and medicine. You should review the solution to the example problem prior to starting your homework. This will give you guidance on how to model the problems, how to appropriately visualize the relevant ideas, work through the mathematical models, and assess your answers. Homework Format: Homework will be posted on Moodle and will consist of full-page sheets (one problem per sheet maximum) that must be printed (on white paper) and used to solve the problems. Please put your NAME at top of the front page of each homework set. (If you are turning in an assignment late, put the date you turned it in.) Each problem will contain a number of parts, intended to help guide the problem-solving process. Each part must be completed and clear work must be shown. All drawings and diagrams must be clean and neatly drawn use a straight-edge where appropriate. Please box your final answer and make certain it has the correct units where appropriate. Work should be neat and legible. Points will be deducted for excessively sloppy work. Please staple all sheets together. Do not mix assignments. Turn them in as separate sets. Homework Administration: Problem sets will be due at the BEGINNING of each class period, and they will be graded and returned the following class period. Late Homework Policy: No late homework will be accepted (with 3 exceptions) It is essential to keep up with the homework. Physics takes time to learn you can t do it all the night before the exam. Late Exceptions: You may turn in up to three (3) late homeworks during the course of the semester. If, for whatever reason, you can not turn the homework on time, do not complete the assignment on time, or whatever, you may turn in the assignment up to one week after the original due date for full credit. Students who do not use all of their exceptions will be awarded extra credit at the end of the semester. Finish Homework It is vital that you attempt the homework by yourself PRIOR to seeking help from other students or the QSC. You will have to take the exams individually, so it is in your best interest to try and do as much of the homework by yourself as you can. If you need help, go first to the textbook and look at the example problems. You might also look to see if there are similar problems at the end of the chapter. You will learn more if you try and work things out for yourself. If you do work with others on the assignment (and/or consult the tutor in the Quantitative Skills Center), please jot their names on your problem set. However, the written solutions must be your own. Representing someone else s work as yours is cheating and will be treated as such. Homework Timeline: In order to have time to do the reading and workbook for the next class, you should begin working on your homework immediately after class. That way you should have plenty of time to finish it. In many cases, you will find that a problem you do not understand clears up after letting it sit for a night. Approximate time required: 2 hours

5 Phys Exams One of the feedback mechanisms for evaluating your learning is the exam. There will be a total of five exams: 3 in-class exams, 1 take-home exam (to be completed on Moodle) and a final exam. The final exam will consist of the material from the final section (1/4 of the exam) and a comprehensive coverage of the semester (3/4 of the exam). Take-home Exam One of the exams will be completed out of class. This exam will be administered through Moodle and you will have 50 minutes to complete the exam. It will consist of 20 multiple choice problems. You will be on the Gentleman s Rule that you do not work with or talk to anyone else in the class about the content of the exam. Although the exam will be open-note, open-book, you will have a limited time to complete the exam. I recommend studying prior to taking the exam and attempting to take it without the use of notes. In-class Exams The in-class exams will be closed book/notebook (No equation sheet or formula sheet will be provided or allowed). The in-class exams will be multiple choice. However, only partial credit will be given for the correct response. For full credit you must provide your work and reasoning for each problem. Unexcused absences for any of the exams will lead to a zero exam score. For an absence to be excused, arrangements must be made in advance with the instructor. Final Exam The final exam will be comprehensive and will be styled in a combination of both the take-home and in-class exams. No equation sheet will be allowed. Lab This lab will be a continuation of your experiences in the Physics 111 Lab. In that lab you learned how to experimentally test models, how to handle uncertainty analysis, and how to keep an accurate lab notebook. You will be expected to continue using these skills in the Physics 112 Lab. You will need to purchase a lab notebook, preferably quad-ruled, for taking data in lab. Notebooks will be graded weekly and you will be responsible for proper uncertainty analysis, when appropriate. However, there are a number of new techniques that will be the primary focus of this lab. Two of the goals for this course are to connect the concepts discussed in class to hands-on experience in the lab. We also want you to make explicit connections between concepts and ideas and models in your primary field of interest. Both of these aspects will be ephasized in the lab. There are three new techniques that you will learn in this lab. These experimental techniques are used frequently by physicists, although they also can apply to all fields of study. They are: 1. creating rough estimates and approximations to sketch out possible experiments; 2. exploring new technology and equipment to understand their inner workings (including calibrating the equipment); and, 3. judging different curve fits for accuracy and appropriateness against real data. The first lab that covers each of these ideas will have a more extensive pre-lab reading so you can get some practice with the new technique. We will emphasize these techiques throughout the semester. Your lab

6 Phys notebook should contain your thoughts and experiences with each of these techniques. In addition, you will be expected to relate the techniques used each week to ideas, models, and skills that could be used in your major field of interest. Grading Course grades will be determined by your total point score as follows: Reading Quizzes 5% Laboratory 25% Homework 25% 1 Take-home exam 5% 3 In-class exams 25% (for all three) Final Exam 15% In addition, To pass this course, all labs must be completed before the final exam, and the average score of all exams must be > 52% irrespective of your homework and lab scores. Your overall course grade is impossible to determine until the end of the semester when all of the points are counted. If you wish to measure your performance, compare your scores to the class distribution which will provided after each exam. If your scores are much below the averages, you should consider getting help. Don t wait until it s too late!! Anyone who receives 90% of the total points will receive at least an A, 80% will receive at least a B, etc. Optional: Historical Paper You have the option of improving your exam grade by writing a five page biographical paper on one of the scientists that played a role in the discovery and description of the physical concepts covered in class. This paper is optional, but if it is submitted, the grade on the paper could replace the score from ONE exam (not including the final exam). Thus, if you feel you have done poorly on an exam, you can submit the paper and replace the poor exam grade with the paper grade. You must get approval from the instructor PRIOR to writing the paper on the person selected as well as the source material to be used as references for writing the paper. The format of the paper is to be at least five single-sided, double spaced pages, using 12 point font, one inch margins, plus title page and bibliography. Getting Help The material in this course is more advanced than in Physics 111 so the tutors in the QSC will not be as helpful. Therefore, the first place to seek help is your instructor me! Don t hesitate to stop by my office during my office hours or send me an with a question. In addition, if there is sufficient interest, I can setup a discussion forum on Moodle for this course so that we can have online discussions of troublesome areas or topics of interest. Academic Support Services: Students with disabilities, whether physical, learning, or psychological, who believe they may need accommodations in this class, are encouraged to contact Academic Support Services as soon as possible to ensure that

7 Phys such accommodations are implemented in a timely fashion. Please meet with Julia Rosenberg (ext. 6024) to verify your eligibility for any classroom accommodations and for academic assistance related to your disability. You may also discuss your disability with the professor if you wish. All discussions will remain confidential. If you have a hidden or visible disability which may require classroom or test accommodations, please see me as soon as possible during a scheduled office hour. If you have not already done so, please visit Academic Support Services (Armory 101) which is responsible for coordinating accommodations and services for students with disabilities. Emergency Procedures In case of a fire, we are to proceed from the classroom out the nearest exit and toward Sparks Center. This holds for both class and the lab. You should join the instructor and the class at Sparks to make sure that everyone got out of the building ok. In the event of a severe weather storm, we are to proceed to the basement and shelter in the basement hallway.

8 Phys Schedule Class Date Class Topic Reading Lab (M,T) (Knight) 1 1/14/2009 Fluid and Pressure No Lab 2 1/16/2009 Buoyancy and Surface Tension 15.4, Moodle 3 1/19/2009 Ideal Fluid Flow 15.5 Buoyancy 4 1/21/2009 Viscosity On Moodle 5 1/23/2009 Turbulance On Moodle 6 1/26/2009 Elastic Properties 15.6, Moodle Fluid Flow 7 1/28/2009 Electric Charge and Force /30/2009 Intro to Fields Take-home Exam , (Classes 1-6) /2/2009 Charge Distributions Turbulance 10 2/4/2009 Motion of Charges in an Electric Field 11 2/6/2009 Gauss s Law , /9/2009 Electric Potential Energy Coulomb s law 13 2/11/2009 Electric Potential /13/2009 Potential and Field /16/2009 Capacitance Electric Potentials 16 2/18/2009 Current /20/2009 Exam 2 (Classes 7-15) 18 2/23/2009 Conductivity Current and Potential 19 2/25/2009 Basic Circuits /27/2009 Real Circuits /2/2009 RC Circuits 32.9 RC Circuits 22 3/4/2009 Magnetic Fields /6/2009 Magnetic Fields of Currentcarrying wires 3/9-3/13 Spring Break No Lab 24 3/16/2009 Forces due to magnetic fields B-Field of Helmholtz coils 25 3/18/2009 Magnetic Torque and Matter /20/2009 Lenz s Law /23/2009 Exam 3 (Classes 16-25) Electron Charge-to-Mass 28 3/25/2009 Electromagnetic Induction /27/2009 Electromagnetism /30/2009 Electromagnetic Waves Light Polarization 31 4/1/2009 Wave Motion /3/2009 Sinusoidal Waves /6/2009 Traveling wave properties Speed of Sound 34 4/8/2009 Standing Waves /10/2009 Applications of Superposition /13/2009 Superposition of Waves in 2D , Standing Waves of Sound 37 4/15/2009 Exam 4 (Classes 26-35) 38 4/17/2009 Double-slit interference and Gratings /20/2009 Single-Slit Diffraction Double Slit Interference 40 4/22/2009 Ray Optics /24/2009 Thin Lenses /27/2009 Lens Equations Index of Refraction 43 4/29/2009 Compound Optics (HW No Credit) 44 5/1/2009 Optical Instruments and Course Summary (HW No Credit)