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PHY 415: Electromagnetic Theory I
Solutions to Problem Set 11 are now posted on Blackboard. Yesterday you received back from me your graded Final Project reports. Final Project oral presentations will be next week Tuesday, December 14, 12:30pm - 3:30pm in BL 269. Each group will get 20 minutes to present their work, followed by 10 minutes for questions from the audience. Please let me know who from your group will be giving the presentation. Please let me know what software you will be using for your presentation, and email me your slides hopefully by Monday evening, and by 10:30am Tuesday at the latest. Attendence at the presentations is required of all students.
Your response to Discussion Question 10 is due this Tuesday at 5pm. This is the last Discussion Question for the course! Problem Set 10 is due this Thursday at 5pm. This is the last required problem set for the course! But . . . for those who are interested, I have posted a Problem Set 11 with some problems related to Unit 7 on special relativity. You can find Problem Set 11 on the Problem Sets page of the website. Do not turn these problems in -- they will not be graded -- but you should try them because expressing electromagnetism in the formulation of special relativity is very elegant and beautiful and you should find the problems fun!!! The solutions to Problem Set 11 will be posted on Thursday, December 9. You should all be well advanced on your Final Project. Your Final Project paper is due next week Monday, December 6, at 9am. Your group representative should email your paper to me at: stte@pas.rochester.edu I will return to you my critique of your paper by 5pm on Thursday, December 9, so that you can use that information to help you prepare your presentation. Final project presentations will be on Tuesday, December 14, from 12:30 to 3:30 in BL 269. Everyone's attendance is required. Each group will get 20 minutes for your presentation, with 10 minutes following for questions. Your presentation should be a set of Powerpoint slides or similar. You should email me your presentation by 10am that morning, so that I can upload them to my laptop to make the session run more smoothly. Please let me know a few days in advance what software you will be using so I can be sure I have that installed. Be sure to practice your presentation in front of your group so that you are sure it will end on time. For a 20 minute presentation, you should probably have no more than 10 slides, and maybe less! Your grade on the Final Project will be split 50% for the paper and 50% for the presentation. For the presentation part of the grade, half will be based on my assessment and half will be based on the ratings of your classmates who will be your audience. A large part of the grade for the article will depend on how clearly you have explained your work, not just whether you have gotten the physics correct. On the Surveys page of the course on Blackboard, please answer the survey about how you would like PHY 418 (Statistical Mechanics I) to be taught next spring. This survey will count 3 points towards the Paticipation part of your class grade, the same as each of the Discussion Questions. You must complete this survey by the last day of classes, Wednesday, December 8, at noon. The feedback you provide will determine how I will teach PHY 418.
Yesterday in the discussion session, two questions came up. One student wanted to know how to derive Eq. (6.3.12) from Eq. (6.3.8). That is, how to get that amplitude for the electric field in the electric dipole approximation, but going beyond the radiation zone approximation. I have now posted Notes 6-3-supp to show how that calculation goes. We also discussed a problem of two charges q1 and q2 orbiting at frequency ω on opposite sides of a circular path. When q1 = q2 we saw that the leading term in the radiation was electric quadrupole, but the frequency of the radiation was 2ω rather than ω. This is because when q1 = q2 , then once the charges have moved half an orbit, the charge configuration looks exactly the same as at the start of the orbit, so the charge density is really osciallting with frequency 2ω. But we saw that there was still electric quadrupole radiation at frequency 2ω even when q1 ≠ q2. How can we explain the 2ω in that case, since now the charge density is not returning to itself after one half period of orbit? I give the answer here.
Discussion Question 9.5 is due this Tuesday at 5pm. For the discussion session this Wednesday, you should have finished reading through Notes 6-3. Thanksgiving break begins at noon on Wednesday, so there is no Problem Set due this week. Have a Happy Thankgiving Break!
The Midterm Exam has been graded. The average was 77.6 with a standard deviation of 19. You may see your grade on Blackboard and you may see a histogram of exam grades, as well as the exam solutions, on the Midterm Exam page on Blackboard. You may pick up your exam by stopping by my office, or by coming to the discussion session this Wednesday.
The Midterm Exam and its solution is now posted on the Midterm Exam page on Blackboard. I hope to have the exams graded to return to you on Wednesday. Discussion Question 9 is due on Tuesday at 5pm and Problem Set 9 is due on Thursday at 5pm. The reading for this week begins the new Unit-6 on Radiation and Fields from Moving Charges. You should all have received your group assignement for the Final Project as well as your group's topic. Your written report is due to me at 9am on Monday December 6. If you have any questions as you work on your project, whether with regard to format or with regard to physics, please feel free to contact me.
Remember, your preferences for final project groupmates are due by 5pm on Monday. Please email Prof. Teitel. There is no discussion question due this week, but Problem Set 8 is due Thursday at 5pm. The Midterm Exam is next week, Wednesday, November 10 in BL 269 from 10:25am to 12:10pm. It will cover all material through the end of Notes 5-2. This week's Wednesday discussion session would be a good time to ask any questions you have as you review the material.
Details of the Final Project are now available on the Unit 8 page. Note, there is a short time line for completing the Final Project. Your first step is due Monday, November 1, by 5pm.
The solutions to Discussion Question 7 and to Problem Set 7 are now posted on Blackboard. Next week there is Discussion Question 7.5 due on Tuesday at 5pm, but there is no Problem Set due next week (I think you are having a quantum midterm then?). For Wednesday's discussion session you should have read up through Notes 5-1 page 5. The Midterm Exam will be on Wednesday, November 10, in BL 269 from 10:25am to 12:10pm. Note, that gives you 1 hour and 45 minutes to work on the exam, and extends 1/2 hour past the usual time of the discussion session. If you have a serious conflict with that extend time period, you must let me know immediately, and by Friday, October 29, 5pm at the very latest. This year's Midterm Exam will cover all material through the end of Notes 5-2. On the "Midterm Exam" page for the course on Blackboard I have posted the midterm exam from last year, so that you can see it as an example of what to expect. You can also see midterm exams from previous years of the class by going to the courses homepages, which you can find on https://www.pas.rochester.edu/~stte/teitel/teaching.html Note, prior to 2020 the midterm was usually given around the end of October, and so did not include some of the material for which you will be responsible on this year's midterm (so you might want to look at some of those prior years' final exams as well). I have written up the problems we discussed in the last two discussion sessions: the magnetizable sphere in a uniform external magnetic field, and how the existence of a magnetic monopole would lead to the quantization of charge. You may find these on the Notes page as Notes 3-4-supp and Notes 4-2-supp. Our TA, Yu-Heng, will be out of town starting Monday, November 22. If you wish to speak or meet with him after that date, you will have to arrange a meeting on Zoom. You can find the Zoom link for Yu-Heng on the "Zoom Links" page for the course on Blackboard. Yu-Heng's office hour on December 1 and 8 will similarly be conducted on Zoom.
The solutions to Problem Set 6 are available on Blackboard. Today I have added some comments to the end of these solutions to explain what is the meaning of the limiting case where μ=∞. It corresponds to a perfect paramagnetic material. I have also added comments to discuss the case μ=0, which describes a perfect diamagnetic material, and is a description for a type I superconductor. You response to Discussion Question 7 is due today at 5pm. Your solutions to Problem Set 7 are due Thursday at 5pm. For our Wednesday discussion session tomorrow you should have read through the end of Notes 4-2.
Please take a moment to complete the department's TA evaluation form at: https://webapps.pas.rochester.edu/secure/phpQ
Problem Set 5 has been graded and the solutions have been posted on Blackboard. There was an update to Notes 4-4 this morning to correct an issue, so if you downloaded them earlier you should redownload them.
For next week, there is a Discussion Question 6 posed that we will discuss on Wednesday, but you do not have to post any reply. Instead, you must fill out the "How's it going?" survey by Wednesday 5pm. This survey, to give me feedback on how the course is going so far, is found on the Survey page for the course on Blackboard. The survey is anonymous, but will count 3 points towards the Class Participation part of your course grade. If you complete it you get 3 points. If you do not complete it you get zero points. By our Discussion Session next Wednesday you should have completed reading the notes for Unit 3, and at the end of the week be moving on to Unit 4 on electromagnetic energy and momentum. Enjoy Fall Break!
Solutions to Problem Set 4 are now available on Blackboard. Discussion Question 5 is due Tuesday at 5pm and Problem Set 5 is due Thursday at 5pm. For our discussion session this Wednesday you should have read up through Notes 3-2. Note: Next week is Fall Break on Monday and Tuesday. So there will be no office hour on Monday, but you may feel free to contact me by email or on Slack if you have any questions. There is a Discussion Question 6 posed for next week, which we will discuss on Wednesday, but no posted response is due from you.
I have written up the problem that we discussed at the end of this Wednesday's discussion session. You may find it on the Notes page as Notes 2-4-supp.
The Solutions to Discussion Question 3 and to Problem Set 3 are now available on the Problem Sets page of the course on Blackboard. Discussion Question 4 is due Tuesday at 5pm. Problem Set 4 is due Thursday at 5pm. For our discussion session this Wednesday you should have finished reading all the notes in Unit 2. At the end of the week we leave electro and magnetostatics and move on to Unit 3, Maxwell's equations in matter.
Your Problem Set 2 has been graded and you can find your graded work on Blackboard. The Solutions to Discussion Question 2 and to Problem Set 2 are now available on the Problem Sets page of the course on Blackboard. Discussion Question 3 is due today at 9pm. Problem Set 3 is due Thursday at 5pm. Remember, we will have our weekly discusssion session tomorrow, Monday morning, in place of my usual office hour. So please prepare any questions you might have on the notes or upcoming problem set. There will be no discussion session on Wednesday.
My apologies for some conflicting information that was on the course website (now corrected). Next week our schedule will somewhat altered from the usual. Since I will not be able to be available on Wednedsay, September 22, I am moving our weekly discussion session to Monday, September 20. Discussion Question 3 will therefore be due on Sunday, September 19, at 9pm. DQ 3 is an interesting extension of DQ 2. Since we are using my usual Monday morning office hour for the discussion session, I can be available for office hour on Monday afternoon if you have any questions you wish to ask. Feel free to stop by my office, BL 455B, between 2 and 3:30pm. If that time does not work for you, email me and we can try to find another time to meet. I will also be available starting Wednesday evening, if you wish to contact me on Slack. This changed schedule will apply only to next week, the week of September 19. Afterwards we return to our usual schedule.
Solutions to Problem Set 1 will be posted on the Problem Sets page of the course on Blackboard monday morning. Please be sure to read the solutions carefully. Even if you think you did well on the problem set you may find a different way to think about a problem. If you did not understand a problem, then certainly read the solutions to see how it could have been done, and ask questions if you still do not understand! My office hour will be as usual this Monday in BL 269. If you want to talk with me privately, use the sign up sheet found on the Instructors page of the course website to reserve a 10 minute slot from 10:25am to 10:55am. Anyone is welcome to join afterwards at 10:55am. Discussion Question 2 is due on Tuesday, Sept 14, at 5pm. You should have read through the end of Notes 2-2 for the discussion session on Wednesday, 10:25am, where we will discuss the last two weeks discussion questions, and I can also try to answer any questions you may have about the notes or problem sets. Problem Set 2 is due on Thursday, Sept 16, at 5pm.
Remember, there will be no office hour this Monday as it is the Labor Day holiday. Note, I will also be unavailable from Monday evening through Wednesday evening, so there will be no discussion session this Wednesday morning. If you wish to ask a question about the Problem Set due this week (or anything else), you can try me Monday during the day, Wednesday night, or Thursday. You can also ask our TA, Yu-Heng, who has office hours on Wed from 5-6pm in BL 361. Discussion Question 1 (which is Discussion Question 1.4.2 in the Notes 1-4) is due by 5pm this Tuesday. Problem Set 1 is due 5pm on Thursday. In response to a question that was asked during my office hour (and to which I probably did not reply as clearly as I should have), I have now uploaded some supplemental notes to discuss in greater depth Faraday's Law, and its relation to motional emf and special relativity. You can find these as Notes 1-3-supp on either the Notes page or the Unit 1 page.
Welcome to PHY 415, Electromagnetic Theory I, and welcome to Rochester! This Home Page is the place to find announcements related to the course. This website has all the information you need to take and do well in the course. If it is on this website, you are responsible for knowing it! The Overview page gives an outline of this website. The Communications page has information about all the methods we will use to keep in touch with each other for this class. Note, to access several features of this website, such as viewing lecture videos, emailing classmates, posting to discussion boards, uploading homework, and viewing your grades, you must first login the the University's Blackboard system using your UR NetID. Please start the course by going to the Meet Your Classmates discussion board (accessible from the course home page on Blackboard) and write a few sentences to introduce yourself to myself and your classmates. What name do you wish to go by? What field of physics do you think you wish to study (I don't know is a valid response)? What is a favorite joke of yours? Then go to the Surveys page on the course home page on Blackboard and take a short, anonymous, suvey to let me know your preparation in math and E&M. COVID ALERT: For the time being, until further notice, all students must wear face masks while participating in any in-person component of the course. Preferably, your mask should be surgical mask quality or better. There will also be no eating allowed in class, and drinking should be kept to a minimum.
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