Physics 1120 Final Exam (May 4, 2002) 10:30AM - 1 PM Exam version 0001 SOLUTIONS
|
|
- Horatio Copeland
- 7 years ago
- Views:
Transcription
1 Physics 1120 Final Eam (May 4, 2002) 10:30AM - 1 PM Eam version 0001 SOLUTIONS 1. Two small objects each with a net charge of +Q initially eert a force of magnitude F on each other. Then we replace one of those objects with a different one whose net charge is -3Q, AND we move them apart, so that the distance between them is twice what it was before. What is the magnitude of the force on the -3Q charge now? Before: F +Q +Q F After: +Q -3Q A) F B) 3F C) 3F/2 D) 3F/4 E) F/4 2. A hollow metal conducting sphere is electrically neutral (There are no ecess charges on it, and none nearby either). A small amount of negative charge is suddenly placed at one point P on this metal sphere. If we check on this ecess negative charge a few seconds later, what will we find? A) All of the ecess charge remains right around P B) The ecess charge has distributed itself evenly over the outside surface of the sphere. C) The ecess charge has distributed itself evenly over the inside and outside surfaces of the sphere D) Most of the charge is still at point P, but some will have spread over the sphere E) There will be no ecess charge left 3. You have three charges arranged on 3 corners of a square, as shown. (Note the signs of the charges!) (B is equally distant from A, and from C.) What is the direction of the electric force on charge B? QA =+1 C A B QB =+1 C F BA C F BC F tot QC =-1 C A) B) C) D) E) None of these is correct Eam 0001 Page 1 of 11
2 4. You have two objects (labelled #1 and #2), with charges +Q and -Q respectively, fied on the -ais at =-d and =+d respectively. (Define voltage to be zero off at infinity) There are no other charges anywhere. At the origin, halfway between the charges, what can you say about the magnitude of the electric field, and the voltage? +Q =0 -Q d d #1 #2 A) E = 0, V = 0 B) E is not zero, V = 0 C) E = 0, V is not 0 D) E is not zero, V is not 0 E) Not enough information to decide. For the net three questions: an electron is placed at rest in the center of a three-dimensional region of space in which there is a uniform electric field. (A uniform field is one whose strength and direction are the same at all points in the region) \ There are no other forces in this problem besides the electric force. Points a, b, c, and d are simply names for points in space, there are no charges at those points! a c 5. When the electron is released from rest in the uniform E field, what will its subsequent motion be? A) It will remain at rest in its initial position. B) It will move at a constant velocity. C) It will move with a constant acceleration. D) It will move with a linearly changing acceleration. E) It will move in a circle with constant speed. 6. Rank the value of electrical potential (i.e. voltage) at the four points (a,b,c, and d) from highest to lowest. (Assume the electron is not present.) A) V(a) > V(b) > V(c) = V(d) B) V(c) = V(d) > V(b) > V(a) C) V(a) = V(c) > V(b) = V(d) D) V(a) > V(c) > V(b) > V(d) E) V(b) = V(d) > V(a) = V(c) 7. Suppose you could put the electron either at point a, or at d, and compare the force it feels. How does the electric force on an electron at those two positions compare? A) Force is greater on a charge at point a B) Force is greater on a charge at point d C) Force is zero at both places D) Force is the same at both places, but is NOT zero E) Force has the same magnitude at both places, but is in different directions. -e b d E 8. The figure shows a solid conducting metal sphere which is electrically neutral. The sphere is held fied in space. A large positive charge +Q is placed near the sphere as shown. Eam 0001 Page 2 of 11 P +Q
3 What is the direction of the electric field at point P, inside the sphere, halfway between the center and the edge of the sphere? (P is just a point in space, there is no charge there) A) Left B) Right C) Up D) Some other direction, but NOT zero. E) Zero field 9. Two charges, -Q and +2Q are fied on the y-ais, a distance a apart, as shown. Point P is on the + ais, a distance "" away. There is no charge at point P; it s empty space. What is the value of the voltage at point P (assume voltage is zero at infinity) A) kq B) 2kQ! kq +y q 1 = -Q a q 2 = +2Q P + C) 2kQ 2 + kq 2kQ D)! kq E) 2kQ 2! kq 10. The figure shows 3 circuits with the same voltage battery, V, and identical light bulbs, all of resistance R. V V V Rank the bulbs in order of brightness, from dimmest to brightest. A) #1 = #2 = #3 = #4 = #5 (all the same) B) (#4= #5), but they are each dimmer than (#1 =#2 = #3) C) (#1 = #4 = #5), but they are all dimmer than (#2=#3) D) (#1 = #2 = #3), but they are all dimmer than (#4 = #5 ) E) (#2 = #3 ), but they are each dimmer than (#1 = #4 = #5) 11. In the circuit shown to the right, a current I1 flows through R1. At t=0, you break R2 (so R2 goes to infinity). Describe I1 before and after t=0. A) Before, I1 is downward. After, I1 is completely unchanged. #1 R #2 R #5 R #3 #4 R R B) Before, I1 is downward. After, I1 is downward, and increased in magnitude. C) Before, I1 is downward. After, I1 is downward, and decreased in magnitude. V1 I3 R1 I1 I2 R2 V2 Eam 0001 Page 3 of 11
4 D) Before, I1 is zero. After, I1 is downward. E) Before, I1 is upward. After, I1 is downward. 12. You have 2 identical bulbs (#1 and #2) connected in series to a power supply. They are both glowing equally. Then you add a resistor R in parallel to bulb #2, eactly as shown in the figure. What happens after "R" is connected? R (Attach this resistor...) A) #1 gets brighter than it was before, #2 gets dimmer than before. B) #1 gets dimmer than it was before, #2 gets brighter than before. C) #1 and #2 both get dimmer than they were before. D) #1 and #2 both get brighter than they were before. E) #1 and #2 stay just the same as they were. V #1 #2 13. An electron (which has negative charge) initially moves horizontally to the right, towards a screen. There are no electric fields in the problem (and no gravity or friction), but there is a magnetic field, B. screen The electron moves along the dashed path shown. In what direction does the B field point? A) Toward the top of the page (in the plane of the page) B) Towards the right of the page (in the plane of the page). C) Into the page. D) Out of the page. E) The magnetic field is in the direction of the curved path. -e v0 B?? 14. Wire 1 has a large current i flowing out of the page, as shown in the figure. Wire 2 has the same large current i flowing into the page. In what direction does the magnetic field point at position P, midway between them? A) Up B) Left C) Right Point #1 #2 P i (out of page) i (into page) D) Down E) B is zero there. 15. Two parallel wires I and II that are near each other carry currents i and 3i both in the same direction. Compare the forces that the two wires eert on each other. Eam 0001 Page 4 of 11 i I II 3i
5 A) Wire I eerts a larger force on wire II than II eerts on I. B) Wire II eerts a larger force on wire I than wire I eerts on II. C) The wires eert equal magnitude attractive forces on each other. D) The wires eert equal magnitude repulsive forces on each other. E) The wires eert no forces on each other. 16. The figures below represent positively charged particles moving in the same uniform magnetic field. The B field is shown, dashed: it points from left to right. It is the same in all three figures. All of the particles have the same charge and the same speed v. I B II III v v v B B Rank the three situations acording to the magnitude of the force eerted by the B field on the moving charge, from greatest force to smallest force. A) I > II > III B) III > II > I C) II > I > III D) III > I > II E) The force is the same in all three figures. 17. Two identical circular current loops are both perfectly horizontal. One of them is placed directly above the other. Parallel currents flow in the direction shown by the arrows. (Each is CCW as seen from above) What can you say about the direction of the magnetic field at the point P midway between the loops? P A) Down B) Right C) Up D) Out of the page E) Zero 18. A circular loop of wire has 10 turns, an area of 0.5 m^2. There is an eternal magnetic field perpendicular to the area. The magnitude of the eternal B field is changing with, according to the formula B(t) =(5!1000 " t) Tesla. (with t in seconds). What is the magnitude of the induced EMF around the loop at t=1.0 msec? A) 5 kv B) 20 V C) 20 kv D) 25 V E) 4 V 19. The four separate figures below involve a tiny light bulb connected to the ends of a loop of copper wire, and a bar magnet. The plane of the wire loop is perpendicular to the ais shown in all cases. The motion of the magnet, or the loop, are indicated in the figures. Eam 0001 Page 5 of 11
6 I) v S N bulb Magnet moves left ais II) S N Magnet stationary bulb ais loop is collapsing (shrinking) III) IV) S N Magnet stationary S N bulb rotates around the ais. ais bulb moves left Magnet stationary v (Note: In figure III, the loop is rotating CCW around the ais, when viewed from the magnet. The motion is like someone twisting a ring around their finger.) In which of the above figures will the light bulb be glowing? A) I, III, and IV only B) I and IV only C) I, II, and IV only D) IV only E) II only. 20. A conducting loop sits flat on a table. There is a large eternal magnetic field which initially points down into the table (perpendicular to the plane of the loop). Over a period of a few seconds, the eternal field is smoothly reversed, so that it ends up pointing up (out of the table). Initial B Final B During those few seconds while the B field is changing from "down" to "up", you watch the loop from above, looking down on it. Which way will current flow? A) Counterclockwise B) Clockwise C) No current will flow D) It starts off clockwise, but as the B field passes through 0 (on its way from "down" to "up"), the current flips, ending up counter-clockwise. E) It starts off counterclockwise, but as the B field passes through 0 (on its way from "down" to "up"), the current flips, ending up clockwise. 21. In the previous problem, the B field ends up pointing up (out of the table, through the loop). Assume B is now held constant. As you look from above, down onto the loop, which way will current flow now? ais A) No current will flow if the B field is held constant. B) Counterclockwise C) Clockwise D) It alternates, CW to CCW, back and forth with. 22. A circuit has a 12 V battery, two 4 Ω resistors, and a 2 H inductor. BOTH switches have been open, as shown, for a long. Eam 0001 Page 6 of 11 switch a 12 V R1 =4! L (2 H) switch b R2 (4!)
7 At t=0, switch "a" (only) is suddenly closed. (Switch "b" is left open!) Just afterwards, at t=0+, what is the approimate current through the inductor? A) 1.5 A B) 2 A C) 3 A D) 6 A E) 0 A 23. The previous circuit is left to sit for a long, with switch "a" CLOSED and switch "b" OPEN. Then, at t=1000 sec, switch "b" is suddenly CLOSED too. Just afterwards, at t=1000+ sec, what is the approimate current through the inductor? A) 1.5 A B) 2 A C) 3 A D) 6 A E) 0 A 24. A radio antenna broadcasts a power P 0 uniformly in all directions. I live a distance R from the broadcast station, and I have a dish receiver of radius r. You live a distance 3 R away from the broadcast station, and you have a dish receiver of radius 3r. Which statement is correct? (Note: each statement has two parts, one about power, one about flu) By "flu", I mean intensity, i.e. energy/(area*) A) Your dish receives 3 s the power, but the same flu, as mine. B) Your dish receives 9 s the power, but the same flu, as mine C) Your dish receives the same power, and the same flu, as mine D) Your dish receives the same power, but 1/3 the flu, as mine E) Your dish receives the same power, but 1/9 the flu, as mine 25. You have two solenoids. Number 1 has twice as many windings, is twice as long, and has twice the diameter, as number 2. What is the ratio of the self inductances, L(1) / L (2) (Hint: Recall, self inductance L = Φ(total) / I) A) 1 B) 2 C) 4 D) 8 E) If you double the period, T of an electromagnetic wave in vacuum, what happens to the wavelength? A) wavelength is the same, it is independent of period. B) wavelength decreases by a factor of 2 C) wavelength decreases by a factor of 4. D) wavelength increases by a factor of 2. E) wavelength increases by a factor of 4 The net two problems refer to this situation: a transformer at a power station is designed to step up the voltage from 120 V (RMS, AC) to 12,000 V (RMS). The voltage oscillates with a frequency of 60 Hz. 27. If the primary (input) side is a coil with 100 turns, how many turns should the secondary (output) side have? A) 1 turn B) 100 turns C) 200 turns D) 10,000 turns E) 12,000 turns Eam 0001 Page 7 of 11
8 28. If the station delivers an average power of 100 MW, what is the maimum instantaneous current flowing out of the secondary side? A) 8.3 ka B) 3.1 MA C) 12 ka D) 5.9 ka E) 17 ka For the net two problems: an electromagnetic plane wave travels in vacuum with an E-field given by E(,t) = 10 sin(2!6"10 8 t) (with E in V/m, in meters, and t in seconds) 29. What is the wavelength of this wave? A) 2 m B) 1 m C) 10 m D) 0.1 m E) 3.14 m 30. The speed of this wave is A) 6E8 m/s B) 3E8 m/s C) 0.3E8 m/s D) 2 m/s E) 0 m/s 31. You look at a light source through two polarizers as shown in the side view diagram below. Polarizer A is oriented in the vertical direction (straight up and down) Unpolarized light Unpolarized Observer Light source (intensity I 0 ) comes from the source. The ais of Polarizer B is oriented 30 degrees from the horizontal. (Recall, polarizer A is vertical.) What is the intensity of the light reaching your eyes? Polarizer B Polarizer A A) 0, no light reaches the observer. B) (1/2)I 0 C) (1/2) I 0 * cos(30 deg) = (0.43) I 0 D) (1/2) I 0 * cos 2 (30 deg) = (0.38)I 0 E) (1/2) I 0 * cos 2 (60 deg) = (0.13)I 0 Incident light ais Polarizer B 32. In lectures, you have seen a varying voltage on the oscilloscope screen like this: The volts/div setting on the 'scope is 10 V/div and the /div setting is 5 msec/div (5!10 "3 sec/div) Voltage 1 div Which of the following is the best conclusion? A) frequency = 60 Hz, Vrms = 23 V B) frequency = 60 Hz, Vrms = 33 V C) frequency = 40 Hz, Vrms = 23 V D) frequency = 40 Hz, Vrms = 33 V E) frequency = 60 Hz, Vrms = 47 V (Please note that I'm asking for "rms" voltage) V=0 1 div Eam 0001 Page 8 of 11
9 33. A variable power supply is connected to the input side of a transformer, and an ammeter which measures current. The ammeter reading is shown in the graph below: Amps Power supply Voltmeter Ammeter Which one of the following graphs could show the dependence of the voltmeter reading? (A) (B) (C) is correct (D) (E) Eam 0001 Page 9 of 11
Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6. Instructions: 1. In the formula F = qvxb:
Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6 Signature Name (Print): 4 Digit ID: Section: Instructions: Answer all questions 24 multiple choice questions. You may need to do some calculation.
More informationMagnetism. d. gives the direction of the force on a charge moving in a magnetic field. b. results in negative charges moving. clockwise.
Magnetism 1. An electron which moves with a speed of 3.0 10 4 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 10 19 C) a. 4.8 10 14 N c. 2.2 10 24 N b.
More information104 Practice Exam 2-3/21/02
104 Practice Exam 2-3/21/02 1. Two electrons are located in a region of space where the magnetic field is zero. Electron A is at rest; and electron B is moving westward with a constant velocity. A non-zero
More information1. The diagram below represents magnetic lines of force within a region of space.
1. The diagram below represents magnetic lines of force within a region of space. 4. In which diagram below is the magnetic flux density at point P greatest? (1) (3) (2) (4) The magnetic field is strongest
More information45. The peak value of an alternating current in a 1500-W device is 5.4 A. What is the rms voltage across?
PHYS Practice Problems hapters 8- hapter 8. 45. The peak value of an alternating current in a 5-W device is 5.4 A. What is the rms voltage across? The power and current can be used to find the peak voltage,
More informationReview Questions PHYS 2426 Exam 2
Review Questions PHYS 2426 Exam 2 1. If 4.7 x 10 16 electrons pass a particular point in a wire every second, what is the current in the wire? A) 4.7 ma B) 7.5 A C) 2.9 A D) 7.5 ma E) 0.29 A Ans: D 2.
More informationDirection of Induced Current
Direction of Induced Current Bar magnet moves through coil Current induced in coil A S N v Reverse pole Induced current changes sign B N S v v Coil moves past fixed bar magnet Current induced in coil as
More informationInduced voltages and Inductance Faraday s Law
Induced voltages and Inductance Faraday s Law concept #1, 4, 5, 8, 13 Problem # 1, 3, 4, 5, 6, 9, 10, 13, 15, 24, 23, 25, 31, 32a, 34, 37, 41, 43, 51, 61 Last chapter we saw that a current produces a magnetic
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If the voltage at a point in space is zero, then the electric field must be A) zero. B) positive.
More informationPhysics 25 Exam 3 November 3, 2009
1. A long, straight wire carries a current I. If the magnetic field at a distance d from the wire has magnitude B, what would be the the magnitude of the magnetic field at a distance d/3 from the wire,
More informationTEACHER S CLUB EXAMS GRADE 11. PHYSICAL SCIENCES: PHYSICS Paper 1
TEACHER S CLUB EXAMS GRADE 11 PHYSICAL SCIENCES: PHYSICS Paper 1 MARKS: 150 TIME: 3 hours INSTRUCTIONS AND INFORMATION 1. This question paper consists of 12 pages, two data sheets and a sheet of graph
More informationLast Name: First Name: Physics 102 Spring 2006: Exam #2 Multiple-Choice Questions 1. A charged particle, q, is moving with speed v perpendicular to a uniform magnetic field. A second identical charged
More informationPHYS 222 Spring 2012 Final Exam. Closed books, notes, etc. No electronic device except a calculator.
PHYS 222 Spring 2012 Final Exam Closed books, notes, etc. No electronic device except a calculator. NAME: (all questions with equal weight) 1. If the distance between two point charges is tripled, the
More informationForce on Moving Charges in a Magnetic Field
[ Assignment View ] [ Eðlisfræði 2, vor 2007 27. Magnetic Field and Magnetic Forces Assignment is due at 2:00am on Wednesday, February 28, 2007 Credit for problems submitted late will decrease to 0% after
More informationPhys222 Winter 2012 Quiz 4 Chapters 29-31. Name
Name If you think that no correct answer is provided, give your answer, state your reasoning briefly; append additional sheet of paper if necessary. 1. A particle (q = 5.0 nc, m = 3.0 µg) moves in a region
More informationPhysics 6C, Summer 2006 Homework 2 Solutions
Physics 6C, Summer 006 Homework Solutions All problems are from the nd edition of Walker. Numerical values are different for each student. Chapter 3 Problems. Figure 3-30 below shows a circuit containing
More informationCandidate Number. General Certificate of Education Advanced Level Examination June 2010
entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 1 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Friday 18
More informationAmpere's Law. Introduction. times the current enclosed in that loop: Ampere's Law states that the line integral of B and dl over a closed path is 0
1 Ampere's Law Purpose: To investigate Ampere's Law by measuring how magnetic field varies over a closed path; to examine how magnetic field depends upon current. Apparatus: Solenoid and path integral
More informationCandidate Number. General Certificate of Education Advanced Level Examination June 2014
entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 214 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Wednesday
More information1. Units of a magnetic field might be: A. C m/s B. C s/m C. C/kg D. kg/c s E. N/C m ans: D
Chapter 28: MAGNETIC FIELDS 1 Units of a magnetic field might be: A C m/s B C s/m C C/kg D kg/c s E N/C m 2 In the formula F = q v B: A F must be perpendicular to v but not necessarily to B B F must be
More informationLesson 3 DIRECT AND ALTERNATING CURRENTS. Task. The skills and knowledge taught in this lesson are common to all missile repairer tasks.
Lesson 3 DIRECT AND ALTERNATING CURRENTS Task. The skills and knowledge taught in this lesson are common to all missile repairer tasks. Objectives. When you have completed this lesson, you should be able
More informationElectroMagnetic Induction. AP Physics B
ElectroMagnetic Induction AP Physics B What is E/M Induction? Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in a complete circuit, a current. Michael Faraday
More informationThe purposes of this experiment are to test Faraday's Law qualitatively and to test Lenz's Law.
260 17-1 I. THEORY EXPERIMENT 17 QUALITATIVE STUDY OF INDUCED EMF Along the extended central axis of a bar magnet, the magnetic field vector B r, on the side nearer the North pole, points away from this
More information( )( 10!12 ( 0.01) 2 2 = 624 ( ) Exam 1 Solutions. Phy 2049 Fall 2011
Phy 49 Fall 11 Solutions 1. Three charges form an equilateral triangle of side length d = 1 cm. The top charge is q = - 4 μc, while the bottom two are q1 = q = +1 μc. What is the magnitude of the net force
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 12 Electricity and Magnetism Magnetism Magnetic fields and force Application of magnetic forces http://www.physics.wayne.edu/~apetrov/phy2140/ Chapter 19 1 Department
More informationAP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules
Name Period AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules Dr. Campbell 1. Four 240 Ω light bulbs are connected in series. What is the total resistance of the circuit? What
More informationReading assignment: All students should read the Appendix about using oscilloscopes.
10. A ircuits* Objective: To learn how to analyze current and voltage relationships in alternating current (a.c.) circuits. You will use the method of phasors, or the vector addition of rotating vectors
More informationPhysics 112 Homework 5 (solutions) (2004 Fall) Solutions to Homework Questions 5
Solutions to Homework Questions 5 Chapt19, Problem-2: (a) Find the direction of the force on a proton (a positively charged particle) moving through the magnetic fields in Figure P19.2, as shown. (b) Repeat
More informationChapter 19 Magnetic Forces and Fields
Chapter 19 Magnetic Forces and Fields Student: 3. The magnetism of the Earth acts approximately as if it originates from a huge bar magnet within the Earth. Which of the following statements are true?
More informationConceptual: 1, 3, 5, 6, 8, 16, 18, 19. Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65. Conceptual Questions
Conceptual: 1, 3, 5, 6, 8, 16, 18, 19 Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65 Conceptual Questions 1. The magnetic field cannot be described as the magnetic force per unit charge
More informationChapter 13: Electric Circuits
Chapter 13: Electric Circuits 1. A household circuit rated at 120 Volts is protected by a fuse rated at 15 amps. What is the maximum number of 100 watt light bulbs which can be lit simultaneously in parallel
More informationChapter 22: Electric motors and electromagnetic induction
Chapter 22: Electric motors and electromagnetic induction The motor effect movement from electricity When a current is passed through a wire placed in a magnetic field a force is produced which acts on
More informationCHAPTER 28 ELECTRIC CIRCUITS
CHAPTER 8 ELECTRIC CIRCUITS 1. Sketch a circuit diagram for a circuit that includes a resistor R 1 connected to the positive terminal of a battery, a pair of parallel resistors R and R connected to the
More informationPhysics 30 Worksheet #10 : Magnetism From Electricity
Physics 30 Worksheet #10 : Magnetism From Electricity 1. Draw the magnetic field surrounding the wire showing electron current below. x 2. Draw the magnetic field surrounding the wire showing electron
More informationElectromagnetism Extra Study Questions Short Answer
Electromagnetism Extra Study Questions Short Answer 1. The electrostatic force between two small charged objects is 5.0 10 5 N. What effect would each of the following changes have on the magnitude of
More informationPHYS 211 FINAL FALL 2004 Form A
1. Two boys with masses of 40 kg and 60 kg are holding onto either end of a 10 m long massless pole which is initially at rest and floating in still water. They pull themselves along the pole toward each
More informationPhysics 2B. Lecture 29B
Physics 2B Lecture 29B "There is a magnet in your heart that will attract true friends. That magnet is unselfishness, thinking of others first. When you learn to live for others, they will live for you."
More informationELECTRIC FIELD LINES AND EQUIPOTENTIAL SURFACES
ELECTRIC FIELD LINES AND EQUIPOTENTIAL SURFACES The purpose of this lab session is to experimentally investigate the relation between electric field lines of force and equipotential surfaces in two dimensions.
More informationMagnetic Field of a Circular Coil Lab 12
HB 11-26-07 Magnetic Field of a Circular Coil Lab 12 1 Magnetic Field of a Circular Coil Lab 12 Equipment- coil apparatus, BK Precision 2120B oscilloscope, Fluke multimeter, Wavetek FG3C function generator,
More informationUNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics
UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics Physics 111.6 MIDTERM TEST #4 March 15, 2007 Time: 90 minutes NAME: (Last) Please Print (Given) STUDENT NO.: LECTURE SECTION (please
More informationMagnetic Fields and Their Effects
Name Date Time to Complete h m Partner Course/ Section / Grade Magnetic Fields and Their Effects This experiment is intended to give you some hands-on experience with the effects of, and in some cases
More informationEDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 4 - ALTERNATING CURRENT
EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 4 - ALTERNATING CURRENT 4 Understand single-phase alternating current (ac) theory Single phase AC
More informationInductors in AC Circuits
Inductors in AC Circuits Name Section Resistors, inductors, and capacitors all have the effect of modifying the size of the current in an AC circuit and the time at which the current reaches its maximum
More informationObjectives. Electric Current
Objectives Define electrical current as a rate. Describe what is measured by ammeters and voltmeters. Explain how to connect an ammeter and a voltmeter in an electrical circuit. Explain why electrons travel
More informationCandidate Number. General Certificate of Education Advanced Level Examination June 2012
entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 212 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Monday
More informationFORCE ON A CURRENT IN A MAGNETIC FIELD
7/16 Force current 1/8 FORCE ON A CURRENT IN A MAGNETIC FIELD PURPOSE: To study the force exerted on an electric current by a magnetic field. BACKGROUND: When an electric charge moves with a velocity v
More informationPractice final for Basic Physics spring 2005 answers on the last page Name: Date:
Practice final for Basic Physics spring 2005 answers on the last page Name: Date: 1. A 12 ohm resistor and a 24 ohm resistor are connected in series in a circuit with a 6.0 volt battery. Assuming negligible
More informationEðlisfræði 2, vor 2007
[ Assignment View ] [ Print ] Eðlisfræði 2, vor 2007 30. Inductance Assignment is due at 2:00am on Wednesday, March 14, 2007 Credit for problems submitted late will decrease to 0% after the deadline has
More informationPS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other.
PS-6.1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy,
More informationPeople s Physics Book
The Big Ideas: The name electric current is given to the phenomenon that occurs when an electric field moves down a wire at close to the speed of light. Voltage is the electrical energy density (energy
More informationHomework #11 203-1-1721 Physics 2 for Students of Mechanical Engineering
Homework #11 203-1-1721 Physics 2 for Students of Mechanical Engineering 2. A circular coil has a 10.3 cm radius and consists of 34 closely wound turns of wire. An externally produced magnetic field of
More informationPHYS 101-4M, Fall 2005 Exam #3. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
PHYS 101-4M, Fall 2005 Exam #3 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A bicycle wheel rotates uniformly through 2.0 revolutions in
More informationAP2 Magnetism. (c) Explain why the magnetic field does no work on the particle as it moves in its circular path.
A charged particle is projected from point P with velocity v at a right angle to a uniform magnetic field directed out of the plane of the page as shown. The particle moves along a circle of radius R.
More informationSolutions to Bulb questions
Solutions to Bulb questions Note: We did some basic circuits with bulbs in fact three main ones I can think of I have summarized our results below. For the final exam, you must have an understanding of
More informationLab E1: Introduction to Circuits
E1.1 Lab E1: Introduction to Circuits The purpose of the this lab is to introduce you to some basic instrumentation used in electrical circuits. You will learn to use a DC power supply, a digital multimeter
More information12. The current in an inductor is changing at the rate of 100 A/s, and the inductor emf is 40 V. What is its self-inductance?
12. The current in an inductor is changing at the rate of 100 A/s, and the inductor emf is 40 V. What is its self-inductance? From Equation 32-5, L = -E=(dI =dt) = 40 V=(100 A/s) = 0.4 H. 15. A cardboard
More informationDC GENERATOR THEORY. LIST the three conditions necessary to induce a voltage into a conductor.
DC Generators DC generators are widely used to produce a DC voltage. The amount of voltage produced depends on a variety of factors. EO 1.5 LIST the three conditions necessary to induce a voltage into
More informationIf you put the same book on a tilted surface the normal force will be less. The magnitude of the normal force will equal: N = W cos θ
Experiment 4 ormal and Frictional Forces Preparation Prepare for this week's quiz by reviewing last week's experiment Read this week's experiment and the section in your textbook dealing with normal forces
More informationMotion of Charges in Combined Electric and Magnetic Fields; Measurement of the Ratio of the Electron Charge to the Electron Mass
Motion of Charges in Combined Electric and Magnetic Fields; Measurement of the Ratio of the Electron Charge to the Electron Mass Object: Understand the laws of force from electric and magnetic fields.
More information2. A conductor of length 2m moves at 4m/s at 30 to a uniform magnetic field of 0.1T. Which one of the following gives the e.m.f. generated?
Extra Questions - 2 1. A straight length of wire moves through a uniform magnetic field. The e.m.f. produced across the ends of the wire will be maximum if it moves: a) along the lines of magnetic flux
More informationThe Simple DC Motor: A Teacher s Guide
The Simple DC Motor: A Teacher s Guide Kristy Beauvais Research Experience for Teachers Center for Materails Science and Engineering Massachusetts Institute of Technology August 2003 Motor Design: Steven
More informationCircuit symbol. Each of the cells has a potential difference of 1.5 volts. Figure 1. Use the correct answer from the box to complete the sentence.
Q.(a) Draw one line from each circuit symbol to its correct name. Circuit symbol Name Diode Light-dependent resistor (LDR) Lamp Light-emitting diode (LED) (3) Figure shows three circuits. The resistors
More informationPre-lab Quiz/PHYS 224 Magnetic Force and Current Balance. Your name Lab section
Pre-lab Quiz/PHYS 224 Magnetic Force and Current Balance Your name Lab section 1. What do you investigate in this lab? 2. Two straight wires are in parallel and carry electric currents in opposite directions
More informationTHE LUCAS C40 DYNAMO & ITS ARMATURE.
THE LUCAS C40 DYNAMO & ITS ARMATURE. H. Holden, March 2011. The Dynamo as a DC generating machine was used extensively in the pre- Alternator era, from the early 1900 s up to the late 1960 s and early
More informationMFF 2a: Charged Particle and a Uniform Magnetic Field... 2
MFF 2a: Charged Particle and a Uniform Magnetic Field... 2 MFF2a RT1: Charged Particle and a Uniform Magnetic Field... 3 MFF2a RT2: Charged Particle and a Uniform Magnetic Field... 4 MFF2a RT3: Charged
More informationExercises on Voltage, Capacitance and Circuits. A d = (8.85 10 12 ) π(0.05)2 = 6.95 10 11 F
Exercises on Voltage, Capacitance and Circuits Exercise 1.1 Instead of buying a capacitor, you decide to make one. Your capacitor consists of two circular metal plates, each with a radius of 5 cm. The
More informationCLASS TEST GRADE 11. PHYSICAL SCIENCES: PHYSICS Test 3: Electricity and magnetism
CLASS TEST GRADE 11 PHYSICAL SCIENCES: PHYSICS Test 3: Electricity and magnetism MARKS: 45 TIME: 1 hour INSTRUCTIONS AND INFORMATION 1. Answer ALL the questions. 2. You may use non-programmable calculators.
More informationSample Questions for the AP Physics 1 Exam
Sample Questions for the AP Physics 1 Exam Sample Questions for the AP Physics 1 Exam Multiple-choice Questions Note: To simplify calculations, you may use g 5 10 m/s 2 in all problems. Directions: Each
More informationANALYTICAL METHODS FOR ENGINEERS
UNIT 1: Unit code: QCF Level: 4 Credit value: 15 ANALYTICAL METHODS FOR ENGINEERS A/601/1401 OUTCOME - TRIGONOMETRIC METHODS TUTORIAL 1 SINUSOIDAL FUNCTION Be able to analyse and model engineering situations
More informationUsing an Oscilloscope
Using an Oscilloscope The oscilloscope is used to measure a voltage that changes in time. It has two probes, like a voltmeter. You put these probes on either side of the thing that you want to measure
More information226 Chapter 15: OSCILLATIONS
Chapter 15: OSCILLATIONS 1. In simple harmonic motion, the restoring force must be proportional to the: A. amplitude B. frequency C. velocity D. displacement E. displacement squared 2. An oscillatory motion
More informationDIRECT CURRENT GENERATORS
DIRECT CURRENT GENERATORS Revision 12:50 14 Nov 05 INTRODUCTION A generator is a machine that converts mechanical energy into electrical energy by using the principle of magnetic induction. This principle
More informationExam 1 Review Questions PHY 2425 - Exam 1
Exam 1 Review Questions PHY 2425 - Exam 1 Exam 1H Rev Ques.doc - 1 - Section: 1 7 Topic: General Properties of Vectors Type: Conceptual 1 Given vector A, the vector 3 A A) has a magnitude 3 times that
More informationChapter 22 Magnetism
22.6 Electric Current, Magnetic Fields, and Ampere s Law Chapter 22 Magnetism 22.1 The Magnetic Field 22.2 The Magnetic Force on Moving Charges 22.3 The Motion of Charged particles in a Magnetic Field
More informationExperiment 8: Undriven & Driven RLC Circuits
Experiment 8: Undriven & Driven RLC Circuits Answer these questions on a separate sheet of paper and turn them in before the lab 1. RLC Circuits Consider the circuit at left, consisting of an AC function
More informationi( t) L i( t) 56mH 1.1A t = τ ln 1 = ln 1 ln 1 6.67ms
Exam III PHY 49 Summer C July 16, 8 1. In the circuit shown, L = 56 mh, R = 4.6 Ω an V = 1. V. The switch S has been open for a long time then is suenly close at t =. At what value of t (in msec) will
More informationSolution Derivations for Capa #11
Solution Derivations for Capa #11 Caution: The symbol E is used interchangeably for energy and EMF. 1) DATA: V b = 5.0 V, = 155 Ω, L = 8.400 10 2 H. In the diagram above, what is the voltage across the
More informationDC generator theory. Resources and methods for learning about these subjects (list a few here, in preparation for your research):
DC generator theory This worksheet and all related files are licensed under the Creative Commons Attribution License, version 1.0. To view a copy of this license, visit http://creativecommons.org/licenses/by/1.0/,
More information7. What is the current in a circuit if 15 coulombs of electric charge move past a given point in 3 seconds? (1) 5 A (3) 18 A (2) 12 A (4) 45 A
1. Compared to the number of free electrons in a conductor, the number of free electrons in an insulator of the same volume is less the same greater 2. Most metals are good electrical conductors because
More informationAircraft Electrical System
Chapter 9 Aircraft Electrical System Introduction The satisfactory performance of any modern aircraft depends to a very great degree on the continuing reliability of electrical systems and subsystems.
More informationAC generator theory. Resources and methods for learning about these subjects (list a few here, in preparation for your research):
AC generator theory This worksheet and all related files are licensed under the Creative Commons Attribution License, version 1.0. To view a copy of this license, visit http://creativecommons.org/licenses/by/1.0/,
More informationELECTRODYNAMICS 05 AUGUST 2014
ELECTRODYNAMICS 05 AUGUST 2014 In this lesson we: Lesson Description Discuss the motor effect Discuss how generators and motors work. Summary The Motor Effect In order to realise the motor effect, the
More informationChapter 19: Magnetic Forces and Fields
Chapter 19: Magnetic Forces and Fields Magnetic Fields Magnetic Force on a Point Charge Motion of a Charged Particle in a Magnetic Field Crossed E and B fields Magnetic Forces on Current Carrying Wires
More informationv = fλ PROGRESSIVE WAVES 1 Candidates should be able to :
PROGRESSIVE WAVES 1 Candidates should be able to : Describe and distinguish between progressive longitudinal and transverse waves. With the exception of electromagnetic waves, which do not need a material
More informationPHY114 S11 Term Exam 3
PHY4 S Term Exam S. G. Rajeev Mar 2 20 2:0 pm to :45 pm PLEASE write your workshop number and your workshop leader s name at the top of your book, so that you can collect your graded exams at the workshop.
More informationPHYSICS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits
PHYSCS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits This experiment is designed to investigate the relationship between current and potential in simple series
More informationC B A T 3 T 2 T 1. 1. What is the magnitude of the force T 1? A) 37.5 N B) 75.0 N C) 113 N D) 157 N E) 192 N
Three boxes are connected by massless strings and are resting on a frictionless table. Each box has a mass of 15 kg, and the tension T 1 in the right string is accelerating the boxes to the right at a
More information6/2016 E&M forces-1/8 ELECTRIC AND MAGNETIC FORCES. PURPOSE: To study the deflection of a beam of electrons by electric and magnetic fields.
6/016 E&M forces-1/8 ELECTRIC AND MAGNETIC FORCES PURPOSE: To study the deflection of a beam of electrons by electric and magnetic fields. APPARATUS: Electron beam tube, stand with coils, power supply,
More informationEðlisfræði 2, vor 2007
[ Assignment View ] [ Pri Eðlisfræði 2, vor 2007 28. Sources of Magnetic Field Assignment is due at 2:00am on Wednesday, March 7, 2007 Credit for problems submitted late will decrease to 0% after the deadline
More informationHow To Explain Why A Car Is Constant After A Push
Practice Final Exam (Answers keys) Booklet Number Instructions: This is a combined essay and multiple-choice exam. Choose the best single answer for each question and clearly mark your choice in the appropriate
More informationAS COMPETITION PAPER 2008
AS COMPETITION PAPER 28 Name School Town & County Total Mark/5 Time Allowed: One hour Attempt as many questions as you can. Write your answers on this question paper. Marks allocated for each question
More informationObjectives 200 CHAPTER 4 RESISTANCE
Objectives Explain the differences among conductors, insulators, and semiconductors. Define electrical resistance. Solve problems using resistance, voltage, and current. Describe a material that obeys
More informationBASIC ELECTRONICS AC CIRCUIT ANALYSIS. December 2011
AM 5-202 BASIC ELECTRONICS AC CIRCUIT ANALYSIS December 2011 DISTRIBUTION RESTRICTION: Approved for Pubic Release. Distribution is unlimited. DEPARTMENT OF THE ARMY MILITARY AUXILIARY RADIO SYSTEM FORT
More informationMagnetism Basics. Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment. Net Effect = Zero!
Magnetism Basics Source: electric currents Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment Net Effect = Zero! Net Effect = Additive! Bipolar: all magnets
More informationObjectives. Capacitors 262 CHAPTER 5 ENERGY
Objectives Describe a capacitor. Explain how a capacitor stores energy. Define capacitance. Calculate the electrical energy stored in a capacitor. Describe an inductor. Explain how an inductor stores energy.
More informationThe University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING PHYSICS. Wednesday, June 17, 2015 1:15 to 4:15 p.m.
P.S./PHYSICS The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING PHYSICS Wednesday, June 17, 2015 1:15 to 4:15 p.m., only The possession or use of any communications
More informationHow To Understand The Physics Of A Charge Charge
MFF 3a: Charged Particle and a Straight Current-Carrying Wire... 2 MFF3a RT1: Charged Particle and a Straight Current-Carrying Wire... 3 MFF3a RT2: Charged Particle and a Straight Current-Carrying Wire...
More informationChapter 30 - Magnetic Fields and Torque. A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University
Chapter 30 - Magnetic Fields and Torque A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University 2007 Objectives: After completing this module, you should
More informationFaraday s Law of Induction
Chapter 10 Faraday s Law of Induction 10.1 Faraday s Law of Induction...10-10.1.1 Magnetic Flux...10-3 10.1. Lenz s Law...10-5 10. Motional EMF...10-7 10.3 Induced Electric Field...10-10 10.4 Generators...10-1
More informationXX. Introductory Physics, High School
XX. Introductory Physics, High School High School Introductory Physics Test The spring 2014 high school Introductory Physics test was based on learning standards in the Introductory Physics content strand
More information