# Register now to access 7 million high quality study materials (What's Course Hero?) Course Hero is the premier provider of high quality online educational resources. With millions of study documents, online tutors, digital flashcards and free courseware, Course Hero is helping students learn more efficiently and effectively. Whether you're interested in exploring new subjects or mastering key topics for your next exam, Course Hero has the tools you need to achieve your goals.

5 Pages

### Lecture_27_Part_1

Course: PHYS 272, Winter 2007
School: Purdue
Rating:

Word Count: 219

#### Document Preview

of Momentum E/M Radiation E field starts motion Moving charge in magnetic field: ! ! ! Fmag = qv ! B What if there is negative charge? ! ! ! Fmag = &quot; q v ! B `Radiation pressure': What is its magnitude? Average speed: v/2 v vE Fmag = q B = q 2 2 c Fmag vE v =q /( qE ) = &lt;&lt; 1 Felec 2 c 2c Fmag Fmag Momentum Flux Net momentum: in transverse direction: 0 in longitudinal direction: &gt;0...

Register Now

#### Unformatted Document Excerpt

Coursehero >> Indiana >> Purdue >> PHYS 272

Course Hero has millions of student submitted documents similar to the one
below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.

Course Hero has millions of student submitted documents similar to the one below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.
of Momentum E/M Radiation E field starts motion Moving charge in magnetic field: ! ! ! Fmag = qv ! B What if there is negative charge? ! ! ! Fmag = " q v ! B `Radiation pressure': What is its magnitude? Average speed: v/2 v vE Fmag = q B = q 2 2 c Fmag vE v =q /( qE ) = << 1 Felec 2 c 2c Fmag Fmag Momentum Flux Net momentum: in transverse direction: 0 in longitudinal direction: >0 Relativistic energy: E = ( pc ) + mc 2 2 ( 2 2 ) Quantum view: light consists of photons with zero mass: E 2 = (pc ) Classical (Maxwell): it is also valid, i.e. momentum = energy/speed 2 ! 1 ! ! S= E!B 0 ! 1 ! ! S = E ! B (in N/m2 ) c 0c Momentum flux: Exercise: Solar is Sail What the force due to sun light on a sail with the area 1 km2 near the Earth orbit (1400 W/m2)? Solution: E= flux = 725 N/C c! 0 ! 1 ! ! S = E!B c 0c ! 1 E E2 S = E = = 4.65 " 10!6 N/m2 c 0c c 0c 2 = 9.3 " 10!6 N/m2 Note: What if we have a reflective surface? Total force on the sail: F = 9.3 N Atmospheric pressure is ~ 105 N/m2 Re-radiation: Scattering Positive charge Electric fields are not blocked by matter: how can E decrease? Cardboard Why there is no light going through a cardboard? Electric fields are not blocked by matter Electrons and nucleus in cardboard reradiate light Behind the cardboard reradiated E/M field cancels original field
Find millions of documents on Course Hero - Study Guides, Lecture Notes, Reference Materials, Practice Exams and more. Course Hero has millions of course specific materials providing students with the best way to expand their education.

Below is a small sample set of documents:

Purdue - PHYS - 272
Maxwell's EquationsFour equations (integral form) : Gauss's law! ^ ! E # ndA =&quot;qinside! ^ Gauss's law for magnetism &quot; B ! ndA = 0Faraday's law Ampere-Maxwell law\$0! ! d ! ^ ! E &quot; dl = # dt ! B &quot; ndA ! ! d' elec # &amp; * B ( dl = 0 \$) I ins
Purdue - PHYS - 272
Magnetic Torque on a Magnetic Dipole MomentA current carrying loop has a tendency to twist in magnetic field Compass needle: collection of atomic current loops Fm = Il B = IA = IhwMagnetic Torque: Quantitative Analysis = IhwTorque () = di
Purdue - PHYS - 272
Reference Frame 0 qv r ^ B= =0 2 4 rAny magnetic field? 0 qv r ^ B= 0 2 4 rcharged tapeMagnetic Forces in Moving Reference FramesTwo protons +e 1 r Electric force: F21,e = q2 E1 =1 e2 ^ r 2 4 0 rvF21,m 2 B1 +e v E1 F21,eMagnet
Purdue - PHYS - 272
Chapter 22Faraday's LawElectric and Magnetic FieldsElectric and magnetic fields are interconnected Moving charges make magnetic fields Magnetic fields affect moving charges Electric and magnetic fields depend on reference frame Change reference
Purdue - PHYS - 272
Effect of E/M Radiation on Matter1. Radiative pressure too small to be observed in most cases 2. E/M fields can affect charged particles: nucleus and electronsBoth fields (E and M) are always present they `feed' each other But usually only elect
Purdue - PHYS - 272
Electric FluxFlux through small area: r ^ flux ~ E &quot; n!A Definition of electric flux on a surface: r ^ ! E # n&quot;Asurfacesurfacer ^ ! E # n&quot;Ar ^ ! E &quot; ndA r r ! E &quot; dAr dAr r electric flux on a closed surface = &quot; E ! dAGauss's Lawsurface
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _Chemistry 115 EXAM II Monday, 6:30 PM March 4, 2002 125Directions: 1. 2. Each student is responsible for following directions. Read this page carefully. Write your name and other requested information
Purdue - PHYS - 272
Faraday's Law and Motional EMF`Magnetic force' approach: ! ! ! ! Ftot = qE + qv ! BE = vB! emf = vB! LIUse Faraday law:emf = &quot; d! mag dt!&quot; mag = B# !A = B&quot; Lv!temf = lim #\$ mag #t#t &quot;0= vB! LIFaraday's Law and Generatoremf = &quot; d! ma
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _Chemistry 115 EXAM II Wednesday, 8:30 PM March 5, 2003 120Directions: 1. 2. 3. 4. Each student is responsible for following directions. Read this page carefully. Write your name and other requested in
Purdue - PHYS - 272
Chapter 19Capacitors, Resistors and BatteriesCapacitor: Charging and DischargingExperiment 1 Experiment 2Capacitor: Construction and SymbolsThe capacitor in your set is similar to a large two-disk capacitor s There is no connecting path throu
Purdue - PHYS - 272
Macroscopic Analysis of CircuitsMicroscopic treatment: insight into the fundamental physical mechanism of circuit behavior. Not easy to measure directly E, u, Q, v. It is easier to measure conventional current, potential difference macroscopic para
Purdue - PHYS - 272
Hall Effect Fm = qv B Fe + FB = 0 eE e = - ev BEe = v BE v B ? +hV&gt;0V = Ee h = v BhHall Effect for Opposite Charges Fm = qv BE v B &gt;0 + V&gt;0EvB ? + V&lt;0Hall EffectBy measuring the Hall effect for a particular mater
Purdue - PHYS - 272
Ammeters, Voltmeters and OhmmetersAmmeter: measures current I Voltmeter: measures voltage difference V Ohmmeter: measures resistance RUsing an AmmeterConnecting ammeter: Conventional current must flow into the `+' terminal and emerge from the `-
Purdue - CHEM - 115
Name _ Section _ Social Security # _ Instructor _ Directions: 1. 2. 3. 4. 5. 6. 7.Chemistry 115 EXAM II Wednesday, 6:30 PM March 10, 2004 Total Points = 120Each student is responsible for following directions. Read this page carefully. Write your
Purdue - CHEM - 115
Name _ Section _ Social Security # _ Instructor _ Directions: 1. 2. 3. 4. 5. 6. 7.Chemistry 115 EXAM II Thursday, 6:30 PM March 3, 2005 Total Points = 120Each student is responsible for following directions. Read this page carefully. Write your n
Purdue - PHYS - 272
RC CircuitsCurrent in an RC circuitI= emf -t / RC e RCharge in an RC circuitQ = C ( emf ) 1 - e-t / RC Voltage in an RC circuitV = ( emf ) 1 - e-t / RC The RC Time ConstantCurrent in an RC circuitemf -t / RC I= e RWhen time t = RC
Purdue - CHEM - 115
Name _CRIB_ Section _ TA _Chemistry 115 EXAM III Wednesday, 8:30 PM April 12, 2006 Total Points = 120Directions: 1. 2. Each student is responsible for following directions. Read this page carefully. Write your name and other requested information
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _Chemistry 115 EXAM III Wednesday, 6:30 PM April 16, 2003 120Directions: 1. 2. Each student is responsible for following directions. Read this page carefully. Write your name and other requested inform
Purdue - CHEM - 115
Name _ Section _ TA _Chemistry 115 FINAL EXAM Thursday, 7:00 PM May 4, 2006 Total Points = 200Directions: 1. 2. 3. 4. 5. 6. 7. Each student is responsible for following directions. Read this page carefully. Write your name and other requested inf
Purdue - CHEM - 115
Name _CRIB_ Section _ Social Security # _ Instructor _ Directions: 1. 2. 3. 4. 5. 6. 7.Chemistry 115 FINAL EXAM Thursday, 1:00 PM May 5, 2005 Total Points = 250Each student is responsible for following directions. Read this page carefully. Write
Purdue - CHEM - 115
Name _ Chemistry 115 Section _ Social Security # _ Instructor _ Directions: 1. 2. 3. 4. 5. 6. 7. Each student is responsible for following directions. Read this page carefully. Write your name and other requested information on this page and on the s
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _Chemistry 115 Final Exam Monday, 7:00 PM April 29, 2002 200Directions: 1. 2. 3. 4. 5. 6. 7. Each student is responsible for following directions. Read this page carefully. Write your name and other re
Purdue - CHEM - 115
Spring 2002 Exam 3 Crib 1. B 2. A 3. A 4. E 5. E 6. C 7. C 8. A 9. D 10.A 11. B 12. C 13. A 14. E 15. E 16. D 17. D 18. C 19. B 20. B 21. E
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _ Directions: 1. 2. 3. 4. 5. 6. 7.Chemistry 115 EXAM III Wednesday, 8:30 PM April 14, 2004 Total Points = 120Each student is responsible for following directions. Read this page carefully. Write your n
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _Chemistry 115 EXAM III Monday, 6:30 PM April 8, 2002 125Directions: 1. 2. Each student is responsible for following directions. Read this page carefully. Write your name and other requested informatio
Purdue - CHEM - 115
Name _ Section _ Student I.D. # _ Instructor _ Directions: 1. 2. 3. 4. 5. 6. 7.Chemistry 115 FINAL EXAM Tuesday, 8:00 AM May 6, 2003 250Each student is responsible for following directions. Read this page carefully. Write your name and other requ
Purdue - CHEM - 115
Name _CRIB_ Section _ TA _Chemistry 115 EXAM II Wednesday, 8:30 PM March 1, 2006 Total Points = 120Directions: 1. 2. 3. 4. 5. 6. 7. Each student is responsible for following directions. Read this page carefully. Write your name and other requeste
Purdue - CHEM - 115
Name _ Chemistry 115 Section _ Student I.D. # _ Instructor _ Directions: 1. 2. 3. 4.5.EXAM III Wednesday, 6:30 PM April 13, 2005Total Points = 120Each student is responsible for following directions. Read this page carefully. Write your name a
Purdue - CHEM - 115
Chem 115 Spring 2002, Exam 2 Key1. E 2. C and E 3. A 4. C 5. B 6. C 7. C 8. D 9. A 10. B 11. E 12. B 13. D 14. C 15. B 16. B 17. D 18. E 19. A 20. D 21. B
Berkeley - DS - 10
Developmental Studies- Lecture Notes WEEK 1: Goal of class: realize the conceptual details &quot;Industrial compression&quot; for example is wrapped up in that part of world, countries go through large transformation from agrarian to industrial jobs. Week 1: W
Berkeley - DS - 10
Developmental Studies: Reading Notes WEEK 1: UNDP, Human Development Report 2005 Chapter 1: The State of Human Development &quot;the test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough f
Reinhardt - HIST - 2111
The Columbian Exchange was the era that Columbus and his men traded of introduced new supplies, foods and animals, to the New World. It is interesting enough that there are a many assortments of things that were introduce during this era with the mos
Berkeley - ANTHRO - 158
Garkay Wong SID: 18616594 ANTH 158 Assignment 1 Nietzsche's proclamation of the death of God1 in his 1882 book The Gay Science stunned the public, and since then, has been a source of much stimulation, debate, and discussion, among his readers for a
Reinhardt - HIST - 2111
Golden The Civil War in America could be argued to have many reasons for its occurrence. For1one reason could be slavery. Some people believe that slavery was the main cause for the war. In some since you could say that would be correct. I believ
Berkeley - DS - 10
Garkay Wong SID: 18616594 GSI: Glenna Developmental studies 10: Section Exercise 1What defines developing and less developed nation-states in my mind is the quality of life being led by individuals within those nation-states and the extent of their
Reinhardt - ENG - 101
Golden4.61Why am I not listening? I'm watching your back: Distinguishing Men and Women's communication.Many divorced marriages have been a result of a lack of communication between couples. This has been tested by sociologist and linguistic pro
Reinhardt - HIST - 2111
I came to this site for the view of the New World, a world of freedom that was desperately wanted by most of the Europeans. I, Captain John Smith, set out for an adventure; an adventure is what I got. When I arrived to the New World, I set up camp as
Reinhardt - HIST - 2111
TyrannyGolden 1Tyranny, the main focus during the collaboration of both Thomas Jefferson's Declaration of Independence and Thomas Paine's Common sense. During the 1770's the people of the United States were fed up with the unwanted control from t
Reinhardt - HIST - 2111
In the late 1700's, during the time of the Declaration of Independence signing, there was another issue that needed to be attended to as well. While most of the northern states abolished it, slavery was still strong in the south. Southern states reli
Reinhardt - HIST - 2111
In the late 1700's, during the time of the Declaration of Independence signing, there was another issue that needed to be attended to as well. While most of the northern states abolished it, slavery was still strong in the south. Southern states reli
Reinhardt - HIST - 2111
GoldenElection of 18561The democratic and republican parties throughout the years have given our nation opportunities to make choices for ourselves. At least most Americans believe that these parties give us choices. If individuals would think
Reinhardt - HIST - 2111
Golden1In the rise of slavery throughout the North and the South some individuals of the southern states were standing to defend slavery. Slavery in the United States was being voted against by the northern states. The southerners needed to defen
*December 3, 2007* Vapor Pressure- pressure exerted by a vapor at equilibrium with the liquid o As temp increases, vapor pressure increases (more molecules escaping into vapor phase!) o As intermolecular forces increase, vapor pressure decreases (le
Native American Southwest C lovis points Palio-indian hunters made these reloadable spears out of stone; named after Clovis, Mexico. Mogollon culture lived from about 150 AD until around 1360 AD; name comes from the Mogollon Mountains which were
January 14th Lecture 1 Measurement: process of assigning a symbol (usually a numeral) according to a set of rules to reflect the amount of a characteristic something (usually a person or animal) possesses May involve categorizing events (qualitat
Exam One Study GuideExam Date: Monday, October 1Chapter One: How is theatre a unique art form o Has an audience. but there's never two performances the same o Human created o Audiences influence actors (2 way communication) Plato's beliefs about
o Notes 9/25/06 o Scriptorium/Scriptoria a place where texts were copied by hand o Runes o Parchment/Vellum made from lamb/calf skin; what important texts were written on o &quot;Kings Sagas&quot; - Earliest sagas written about the kings of Norway o Saga m
Berkeley - ARCH - 140
Lecture 5 Arch 140 Storing Heat: Building Materials and Thermal Mass -Heat Transfer -Conduction -Radiation How building materials absorb heat, how we make intelligent choices about buildings. Factors that help us choose what to make buildings out of?
Berkeley - ARCH - 140
Bring LOFSAC to Thursday lecture, to section on Friday Print and Bring Lab1 to section, Review Case Study materials Check Email for final section assignments. Buildings have metabolism, heat from the sun might be desirable, or it might be a liability
Berkeley - ARCH - 140
40 % of landfill waste is from construction. Carbon emissions are higher and cause higher global surface temperature change. Climate change and environmental impacts -agriculture and biodiversity, drought and flooding, intensity of hurricanes, ecosys
Tufts - EC - 60
1-22-08 Reccomended readings Read chapter 2.when you get books Gravity model Influcen of econs size on trade Distance and other factors that influence trade Borders and trade agreements Gobalization then and now Changing composition of trade Multinat
Tufts - PS - 46
3/9/2008 4:23:00 PM 1. modern thinkers have made it too easy to describe state of nature physical o anthropological current o best machine out there, mainly respondents to stimuli, not aware of mortality, no fear, asocial preservation o not as domest
Tufts - PS - 116
Judicial PoliticsMost in judiciary trained as lawyers Soooo. LAWYERS Most lawyers not in court system Lots of laywers, big growth Jobs o criminal Judges Prosecutor DA, state's attorneys Elected sometimes Defense o Civil 1/24/2008 1:32:00
Tufts - PS - 116
3/8/2008 2:55:00 PM Merit system=contradictions Veneer of objectivity vs policy support Judical independence vs accountability o &quot;On one hand we want judges to be independent and impartial. On the other hand, we want all officials who exercise power
Tufts - PS - 111
Constraint-the interconnectedness of ideas, binds together a belief system. What goes with what. Success we would have in predicting. More constraints=more politically active Levels of Conception-citizens capable of expressing real opinions on govt p
Michigan - PHYSICS - 240
Form 1 Physics 240 First Practice Exam Winter 20071. Last Name:_First Name:_2. Please circle your discussion instructor and section below:Instructor Krisch Krisch Krisch Chupp Chupp Chupp Time 10-11 11-12 12-1 12-1 1-2 2-3 Section 010 011 012
Michigan - MATH - 425
Math 425 Section 008 Homework 1 Chapter 1, problems 1, 8(d), 11, 13, 20, 25, 29 Problem 20. A person has 8 friends, of whom 5 will be invited to a party. (a) How many choices are there if 2 of the friends are feuding and will not attend together? (
Michigan - MATH - 425
Math 425 Section 007 Homework 3 Chapter 3, problems 7, 10, 15, 26, 30, 39, 57, 62, 70 Problem 15. An ectopic pregnancy is twice as likely to develop when the pregnant woman is a smoker as it is when she is a nonsmoker. If 32% of women of childbeari
Michigan - MATH - 425
Math 425 Section 008 Homework 2 Ch. 2, problems 3, 8, 13(a), 15(d), 32, 33, 37, 45, 47 Problem 3. Two dice are thrown. Let E be the event that the sum of the dice is odd; let F be the event that at least one of the dice lands on 1; let G be the eve
Michigan - MATH - 425
Math 425 Section 8 Homework 7 Chapter 5, problems 1,5,8,10,14,21,23,27,32 Problem 5. A filling station is supplied with gasoline once a week. If its weekly volume of sales in thousands of gallons is a random variable X with p.d.f. f (x) = 5(1 - x)4
Michigan - MATH - 425
Math 425 Section 008 Homework 5 Chapter 4, problems 14, 22(a), 30, 35, 36, 38, 41, 43, 48 Problem 14. Five distinct numbers are randomly distributed to players numbered 1 to 5. Whenever two players compare their numbers, the one with the higher one