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# Electricity&MagnetismI PHY350

EMU

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This 9 page Class Notes was uploaded by Johathan Lemke on Sunday October 11, 2015. The Class Notes belongs to PHY350 at Eastern Michigan University taught by JamesCarroll in Fall. Since its upload, it has received 38 views. For similar materials see /class/221482/phy350-eastern-michigan-university in Physics 2 at Eastern Michigan University.

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Date Created: 10/11/15

EMUAPPENDIX PHY 350 quotElectricity and Magnetismquot Grading Technique On most problems the following scale was used to assign grades 10 7 technically sound and complete 9 simple error mathematical 8 7 simple physics error incorrect magnitude or direction 7 multiple simple physics errors or a major conceptual aw 47 various errors of serious nature 3 correct starting point with no success 1 tried something 0 nothing attempted As well in problems where a latter section requires answers om a previous section full credit was giving it the analysis was technically sound just with improper values due to earlier mistakes Speci c Content Standards Standard IV 1 Matter and Energy Homework 2 problem 1 32 and 33 In this problem the students must compare the strength of electrostatic forces with that of gravitational forces This comparison is used to describe the basic building block ofnature the atom a positive nucleus and negative electrons attracted to one another by the electrostatic force Gravity plays no role in the atom Homework 1 problem 3 In this problem students measure the electric eld created by an electric dipole Understanding the nature of the electric dipole is essential to understanding the electrical properties ofmost materials as typically the atom itself is modeled as an electric dipole The general form ofthe electric eld far from the dipole is calculated by the student and latter in the course is used to model the dielectric nature ofmaterials Homework 2 problem 2 All to often students merely calculate the electric eld and do not analyze the form ofthe functions they have found They do not recognize what the functions they have found mean for the electric eld and therefore cannot describe the resulting interaction with charged objects The electric eld created by a ring of charge is unique because the electric eld it generates is Zero at the center ofthe ring behaves linearly near the center and thus simple harmonic motion can result these characteristics are shown in lectures that follow the completion ofthis assignment It is also unique because it has a maximum value meaning particles can be trapped along the vertical axis ofthe ring depending on their initial energy EMUAPPENDIX Standard IV 3 Motion of Objects The entire course focuses on determining the electric field in some region of space using the techniques of electrostatics the formal definition of the electric field Gauss39 Law the electric potential and solutions to Laplace39s and Poisson39s equations Once the electric field is found the force on a charged object in that field is measured and then finally its motion in the field is determined acceleration velocity and displacement First students must learn and understand the techniques for determining the electric field The course builds all the tools and techniques that form Maxwell39s Equations and subsequently leads to the description of electromagnetic waves Homework 1 problem 2 In this problem students determine the position of a charge such that the net electrostatic force acting on it is zero Thus the charge will not move Part c then expands the idea of equilibrium into the concepts of stable equilibrium the charge will return to its location if slightly perturbed or unstable equilibrium the charge will never return to its location if slightly perturbed Homework 1 problems 4 and 5 In problem 4 students determine the electric field created by a set of charges each with the same magnitude each equally spaced Problem 5 is exactly the same problem except the integral is used to calculate the electric field of this continuous distribution of charges As students discover in this problem the integral is nothing more than a fancy way of adding up the electric field due to small amounts of charge uniformly distributed spaced along the line Homework 2 problems 3 4 and 5 In most reallife situations involving insultors the charge distribution is simply not uniform These problem modify the distribution of the charges onin an object to further the student39s ability to model the electric field created by real objects The simple line of charge problem 3 is modified to distribution where most of the charge is directly over the top of center and little is off to the sides Problems 4 and 5 are modifications demonstrating radial symmetry to using Gauss39 Law to determine the electric field HW 1 PHY 350 Dr Carroll Winter 2001 PUT YOUR ANSWERS ON THIS SHEET AND ATTACH YOUR NEATLY WRITTEN SOLUTIONS 1 Three point charges are located on the corners of an equilateral triangle as shown below Calculate the net electric force on the 700 gC charge Answer 14 EMUAPPENDIX W O 2 Two beads having charges of 3q and q are fixed at opposite ends of an insulating rod of length d c o o aWhere can a third charge be placed such that it is in equilibrium b Does the third charge have to have a specific magnitude or sign c If the third charge is negative will it be in stable equilibrium What about if the third charge is positive Comment 3 An electric dipole consists of two equal but oppositely charged objects separated by a distance 2a as shown in the picture below 00 aFind E a distance b along the horizontal axis Assume b gt a bIf b is very far away b find E Ex cFind E a distance c along the vertical axis dAgain if c is very far away c how does the electric field behave Is it like a point charge Give the answer and comment 4Consider an infinite number of identical charges q placed on the xaxis at distances a 2a 3a 4a from the origin What is E at the origin due to this distribution 5 Now consider an infinitely long horizontal rod with a total charge Q distributed uniformly along its length The rod is located a distance quotaquot to the right of the origin What is E at the origin due to the distribution HW 2 PHY 350 Dr Carroll Winter 2001 Name 15 EMUAPPENDIX PUT YOUR ANSWERS ON THIS SHEET AND ATTACH YOUR w WRITTEN SOLUTIONS 6 a Problem 33 Answer b Problem 32 Answer 7 Where is the electric eld a maximum along the aXis of a uniform ring of charge if the radius is R and the total charge is Q Answer What is the maXimum value of the electric eld Answer 8A line of charge is bent into a semicircle of radius R 60 cm A total charge of 12 pC is placed on the rod The charge is distributed according to the following ll lCthl lI XO cos 0 where X0 is a constant Find the E at the center of the semicircle Answer 9 A solid sphere of radius R has a nonuniform charge distribution throughout its volume given by the ll lCthl lI p r c r where c is a constant The total charge in the sphere is Q a What is the constant c in terms of Q and R Answer b What is the E inside the sphere Answer c What is the E outside the sphere Answer 10 A hollow spherical shell has an inner radius quotaquot and an outer radius quotbquot Charge is distributed throughout the volume of the shell as given by the following mction p r k r2 where k is a constant The total charge in the shell is Q a What is the constant kin terms of Q a and b Answer b What is the E inside the shell for r lt a Answer c What is the E in the walls of the shell where a lt r lt b Answer 16 EMUAPPENDIX dWhat is the E outside the shell for r gt b Answer PHY 360 Heat and Thermodynamics This course provides investigates fundamental concepts in thermodynamics including heat entropy temperature thermal energy equations of state and phase changes Students are provided with both the theoretical underpinnings of the topic and practical applications Weekly problem assignments are submitted for grading by the instructor and periodic tests are given during the course A sample test is shown below along with data reflecting the outcome of the test PHY 360 Test 2 March 15 2001 To receive full credit you must show all work including your starting equations in algebraic form Make sure your nal answer has the correct units L25 points Carbon dioxide in a leak proof pistoncylinder arrangement is allowed to cool from 400K to 300K at a constant pressure of 101 kPa aCalculate the amount of heat per kilogram that leaves the C02 during the cooling process using any algebraic method where you can justify approximations you make in class we discussed several approaches to this type of calculation You should aim for a final answer which is accurate to within one percent bIs there any work done by or on the Col during this process Explain If there is work you do not need to calculate a numerical value 225 pointsSteam at 550 C and BMPa is throttled to 5MPa Determine the temperature of the steam as it exits the throttling valve 3 25 points075m3 of He gas at 200 kPa and 300K is allowed to expand until the pressure drops to 130 kPa subject to the condition that PVquot67constant during the expansion aIs it safe to treat the helium as an ideal gas Explain bHow much work is done by the gas during this process 425 pointsA ceramic bowl of water is left outside on a winter day when the temperature is well below freezing The thermal conductivity ofwater is about 06 Wm39K for ice about 2 Wm39K and for the ceramic about 07 Wm39K The bowl has inner radius 8 cm height 9 cm and walls that are 06 cm thick A 14 cm layer ofice has formed on the top of the water Is the rate of heat loss through the side of the bowl likely EMUAPPENDIX to be greater than or less than that through the ice layer Justify your response by calculating both heat loss rates The average grade for all 18 students was 73 with a range of 34 to 98 Points were assigned based not only on the student39s nal answer but the correctness arity ofrtheir explanation and cl PHY 370 Introduction to Modern Physics quotIntroduction to Modern Physicsquot is a very instructive course It reviews the historical development of Modern Physics step by step Usually it describes a new experimental observation around the end of 1939 century to the beginning of 2039 century analyzes how the new observation conflicted the old concept and the classical theory couldn39t explain it reveals the need of new theory describes how the new theory was developed and successfully explained the observation and predict new phenomenon that had not found yet how a new discovery conformed the theory etc It is a very interesting course Students learn a lot from the course improving their concepts and building a sound ground for further study Use quotPhotoelectric Effectquot as an example Hertz observed the effect in 1887 The classical theory that treated light as a wave couldn39t explain the effect Einstein introduced quantum concept treated light as particles photons Each photon possesses energy of hf The electron inside a metal absorbed the energy of photon when a light beam was incident on the metal Part of the absorbed energy called work function would be used for the electron to get rid of metal and the remaining if no any lost became its kinetic energy To stop the electrons which jump out of the metal moving toward to anode a reversed negative voltage V was needed The stopping voltage that stopped all the electrons with different kinetic energy was given by eVopping KEX hf where KE is kinetic energy If the energy of photon hf was less than 0 of metal no electron could be emitted from the metal So the threshold frequency ie wavelength that can knock out electron was given by hf f hcX 0 Equation eVsmng hf 0 and hf hck 0 include all the story and concepts of photoelectric effect I explain the effect teach these two equations and assign the homework of using the equations to check the students if they understand the effect and can use the equations to solve the problems The assignments from the text quotModern Physicsquot by Paul A Tipler and Ralph A Llewellyn Y39 edition are listed below 325 The work function of cesium is 19eVfa Find the threshold frequency and wavelength for the photoelectric effect Find the stopping voltage if the wavelength of the incident light is b 300nm and c 400nm 327 The work function of molybdenum is 422eV a What is the threshold frequency for the photoelectric effect in molybdenum b Will yellow light of wavelength 560 nm cause ejection of photoelectrons from molybdenum 3 30 The longest wavelength oflight that will cause the emission of electrons form cesium is 653 nm a What is the work function for cesium b Iflight of EMUAPPENDIX wavelength 300 nm ultraviolet were to shine on cesium what would be the energy of the ejected electrons The homework possesses 20 points out of 100 points total I assign about 120 problems throughout the semester for the homework Each problem weighs 16 point I post the correct answers of homework on the wall in hallway I don39t grade the homework problem by problem I collect homework four times a semester before test Student who nishes all assignment gets 5 points toward to the total points I arrange a homework discussion before each test due day of homework Any dif culty student encounters in solving the problems are addressed in the discussion The photoelectric problem is also used in the test The following problem was in Test 2 ofFall 2001 2 The threshold wavelength of the photoelectric effect for silver is 262nm Find the stopping voltage if the incident radiation has a wavelength of 200nm h 4136 10 quot eV sec and he 1240eV nm The test which consisted of 5 problems weighs 15 points of 100 total This problem weighs 3 points If student can list correct equations he gains 1 point can substitute data with correct unit he gains another point can calculate and get correct answer he gains full points A similar problem was used in the fmal exam Fall 2000 The nal exam consisted of 6 8 problems weighs 20 points The problem weighs 25 33 points The grading method is similar depending correct application of equations correct use of units and correct calculation PHY 406 Ethical issues in Physics Ethical Issues In Physics PHY 406 Winter 2001 Instructor Marshall Thomsen 302B Strong 487 8794 Discussion Wednesday 1100 1150 Room 341 The purpose of this course is to acquaint you with ethical issues a career Physicist may face We will examine general ethical principles scienti c ethics and what to do when ethical principles con ict The case studies we will use come primarily from the physics community You will have weekly reading assignments and you will be expected to actively participate in classroom discussion The reading assignments will be made available outside my office or will be taken from Ethical issues in Physics Workshop Proceedings available at httpww nl lvcirc pmirl l u a 39 l1 GRADING tm PARTICIPATION10 pointsYou will be awarded up to ten points for active EMUAPPENDIX participation in classroom discussion throughout the term READING QUIZZES10 points There will be an unspeci ed number of unannounced reading quizzes throughout the term worth ten points each This portion of your grade will be based on the average of those reading quizzes The purpose of these quizzes is not to require extensive memorization but rather to determine if you are sufficiently familiar with the reading assignment to discuss it WRITTEN EXERCISES10 points There will be one short written exercise as announced in class LESSON PLAN ANALYSIS10 points You will be assigned a lesson plan on line to analyze and discuss in class RESEARCH PAPER60 points total You will be assigned a topic on which to do research The first portion of this project will be a group project Your group will compile factual information related to the assigned topic and develop a list of ethical issues raised by this information Your group will then submit a 710 page background paper typed doublespaced containing this information This will be worth up to 25 points You will then write an individual paper in which you analyze the ethical issues in light of the factual information accumulated It is to be expected that individual analyses should differ significantly so you should not collaborate on this portion of the project This 35 page paper will also be worth up to 25 points Finally your group will make a 30 minute oral presentation of your background paper and analysis GRADING SCALE Agt90gtBgt80gtCgt70gtDgt60gtE EMUAPPENDIX PHY 406 Ethical issues in Physics COURSE OUTLINE tentative 110 IntroductionCareers in ScienceThe Scienti c Community 1 17 General Ethical Principles Resnik I 124 Speci c Principles of Research Ethics Kaarsberg appendices only 131 Data Analysis the Millikan Oil Drop Experiment Segerstrale not available online 27 Data Analysis General guidelines Laboratory courses Handout Group topics assigned 2 14 SHORT WRITTEN ASSIGNMENT DUE Plagiarism no reading assignment Short group meeting 221 Physics and Society Kaarsberg Paper 228 Physics and Society Feynman as advisor not available online 314 Physics and Society The Manhattan Project not available online 321 Physics and Society The News Media Resnik II 328 Con ict of Interest TBA FACT PAPERS DUE 44 Funding and Peer Review Slakey 411 Lesson Plan Discussion 418 Lesson Plan Discussion ISSUE ANALYSIS PAPERS DUE 425 Oral Presentations exam day Academic dishonesty such as cheating on a quiz or a test or plagiarizing material is incompatible with a learning environment and will be treated in accordance with University policy including sanctions ranging from a zero on the assignment to failure in the course and referral to Student Judicial Services The instructor reserves the right to make changes in this syllabus YOU ARE RESPONSIBLE FOR ALL CHANGES TO THE SYLLABUS INCLUDING CHANGE OF DUE DATES THAT ARE ANNOUNCED IN CLASS 21

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