======== Announcement about Final Exam for Physics 122, Sec. 2 ============ Reminder: Homework #12: Chap. 28 #10, 34, 38, 47; Chap 29 # 10, 17, 20, 28 is due on Friday May 15. Please hand it to your TA by 5pm Friday Solutions will be posted Friday evening to facilitate your study for the final exam. The Final exam will be held in our regular lecture room PHY 1412 on May 19 Tue 1:30- 3:30 pm. If you don’t show up for the final exam, you will automatically get a F for the course by University Academic Ordinance. The Final exam is comprehensive, meaning, all materials in prior mid-term exams and in lectures plus materials in Ch 28 and Ch. 29 (Sec. 1-6 only) . You can bring your 3 old formula cards plus a new 4”x6” index card, and a non-programmable calculator. The Final Exam will have 8 problems, at least two from the material after MT3, and roughly 2 each from the materials of the three midterm exams. But note that a single problem may contain materials from different chapters. One important aspect of a final exam as different from a midterm exam or a quiz is to test how well you can amalgamate all the materials you learned here (and some basics from 121), and know how to apply them in an integrated and dynamic way. Here’re some suggestions for your preparation: 1) As a rule stated before, read the book chapters, study the examples given in the book, study the lecture notes and the examples given in class, go over homework problems you didn’t get right, work on the review problems and work out more problems from the book. Review problems for this last part of the course: Chapter 28: #8, 23, 36, 39, 45 Chapter 29: #2, 11, 13, 26, 29 It will also be useful to study the review problems suggested earlier for MT1-3 2) Remember you are also responsible for materials covered in the lectures. The lectures serve several functions, to expound the basic concepts, to detail some skimpy derivations, to make up for important topics missed out in the book and to develop strategies for problem solving. Study the posted lecture notes because there are important materials not contained in the book (such as the energy density of magnetic field as stored in inductors similar to that of electric field energy in capacitors) -- so don’t complain if they look unfamiliar because of your chosen absence. A side remark: In the class notes on the topics of magnetic forces, fields and induction you will find several examples using calculus which I explained are provided for the benefit of those who know it (a good fraction of the class does) but it should not be viewed as penalizing (in one student’s terminology) those who don’t, because they can as well be derived using increments and arguments, as often done in the book. The purpose of this extra effort is for enrichment, not as an extra demand, much less a requisite. As a change of emphasis, on page 2 here is a quiz in Section 1 of 122 which Professor Redish provided. You can have a taste of the material taught in the tutorial vein.Name_____________________________________________________ Physics 122 Dr. E. F. Redish Fall 2009 Quiz #9 4. May. 2009 (10 points) Place the letters corresponding to all the correct answers in the box to the left of each figure. 1. (3 pts) Two light bulbs A and B are connected in series to a battery that maintains a constant voltage. When a wire is connected across B as shown, bulb A (a) burns more brightly. (b) burns as brightly. (c) burns more dimly. (d) goes out. 2. (3 pts) The figure at the right represents a junction, which is a small piece of a complex network consisting of batteries and bulbs. The dotted lines connect to other parts of the circuit. The letters A, B, and C simply indicate points on the wires. They are not devices. While the network is carrying current in a steady state, which of the following statements can you make with confidence about the points A, B, and C? (a) The magnitudes of the currents flowing through A and B add up to the magnitude of the current flowing through C. (b) The magnitudes of the voltages at A and B add up to the magnitude of the voltage at C. (c) The sum of the magnitudes of the currents at two of the points adds up to the magnitude of the current of the third (but we can’t say which). (d) The sum of the magnitudes of the voltages at two of the points adds up to the magnitude of the voltage at the third (but we can’t say which). (e) The magnitude of the currents flowing through all three points are equal. (f) The magnitude of the voltages at all three points are equal. (g) We can’t say anything without knowing what the rest of the network looks like. 3. (4 pts) If all the bulbs are identical, then you’d expect (a) bulb A would be the brightest, B and C would be equal and next brightest, and D would be the dimmest. (b) bulbs B and C would be equal and brighter than A and D, which would be equal. (c) bulbs A and D would be equal and brighter than B and C, which would be equal. (d) bulb A would be the brightest, and B, C, and D would all be equally bright. (e) all bulbs would be equally bright (f) something else (explain on
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