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### 032-Electric Field

Course: PHYSICS 20339841, Spring 2012
School: Aarhus Universitet,...
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Word Count: 822

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Draw Electrostatics LO's electric field lines Calculate the strength of an electric field 1/23/12 Aim: What is an Electric Field? Agenda 1. DNQ 2. Demo 3. Notes 4. Example Problems Test Yourself In which direction will charges move in the diagram shown: A)To the left + B)To the right C)The electrons will not move - http://nsdl.org Self Check? Charges flow from less negative to more negative areas. True...

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Draw Electrostatics LO's electric field lines Calculate the strength of an electric field 1/23/12 Aim: What is an Electric Field? Agenda 1. DNQ 2. Demo 3. Notes 4. Example Problems Test Yourself In which direction will charges move in the diagram shown: A)To the left + B)To the right C)The electrons will not move - http://nsdl.org Self Check? Charges flow from less negative to more negative areas. True False True False Like charges repel. http://nsdl.org Charge Quiz What are the charges on the objects shown? Use the + or symbol to indicate the charge on the picture How can you tell? http://nsdl.org Electric Field The electric force is a field force, it applies force without touching (like the gravitational force) In the region around a charged object, an Electric Field is said to exist Electric Fields Charged particles alter the space around them. This alteration is called an electric field. We use a particle of VERY SMALL POSITIVE CHARGE as a field detector. Forces on Charges Applet I Applet II Electric Fields con't. Rules for Drawing Electric Field Lines 1. The lines point TOWARD negative charges and AWAY from positive charges 2. The number of lines drawn is proportional to the magnitude of the charge. 3. No two field lines can cross each other. 4. The line must be perpendicular to the surface of the charge Electric Field Applet Charged Objects All objects that are charged exhibit an electric field. Ex. Parallel plates, dipoles, charged spheres uu r u F r 1 kq0 q E E= =( ) 2 q0 q0 r Electric Field or u kq r E= 2 r Electric Fields is measured in force per unit of charge. E electric field strength, N/C VECTOR q0 + test charge, C q charge producing field, C r distance between charges, m FE Electric Force, N VECTOR kc coulomb constant, 8.99x109Nm2/C2 Conductors in Electrostatic Equilibrium 1. The electric field is zero everywhere inside a conductor. 2. The electric field just outside the charged conductor is perpendicular to the conductor's surface. 3. On an irregularly shaped conductor, charge tends to accumulate where the radius of curvature is the smallest, i.e. AT SHARP POINTS. Electric Field Strength Units: newtons per coulomb Defined as E = F/q E = kQ/r2 is the field strength due to a point charge Q as measured at some point `r' from Q. Practice Problem #1 Practice Problem #2 What is the magnitude of the electric field intensity at a point where a proton experiences an electrostatic force of magnitude 2.30 1025 newton? Electrostatic Demonstrations "Static" Electricity When comb you your hair and... ... bring your comb over a pile of paper bits http://nsdl.org "Static" Electricity What will happen? A. B. http://nsdl.org "Static" Electricity The force felt by the paper bits is due to a difference in charge on the comb compared to the paper. This "force of attraction" was first observed by the Greeks who found that piece of amber ("elektron") attracted other objects when rubbed. http://nsdl.org Match the diagram below with its correct description. 1. 2. 3. Deficiency of Balanced atom Electrons Net Charge Net Charge Zero Positive A. B. Excess of Electrons Net Charge Negative C. http://nsdl.org "Static" Electricity Usually charges balance each other out, and nothing happens. But when two objects with like charges (all positive or all negative) come together, the charges repel and the objects move away from each other. Objects with opposite charges attract each other because the different charges want to balance each other. Objects can get a negative charge by picking up electrons from other objects. http://nsdl.org Common Misconceptions about "Static" Electricity Actually, the thing we call static electricity is an imbalance in the amounts of positive and negative charges found on the surface of an object. http://nsdl.org Methods of Charging Induction Direct contact Results in a transfer of charges Usually results in a temporary rearrangement of charges http://nsdl.org Common Misconceptions about "Static" Electricity Lightning is like static electricity, except on a much bigger scale. Both lightning and static electricity happen because of the attraction between the opposite charges. http://nsdl.org PT III: Charging an Electrophorus Rub the Styrofoam plate with cloth or a paper towel. Set the pie tin down on the picnic plate. Hold it by the plastic cup. Using an Electrophorus to Store Charge Touch the foilwrapped cardboard and the pie tin at the same time, then let go. Hold the plastic cup and lift the pie tin. Touch it to the nail on the Leyden Jar. Repeat. The Leyden Jar The Leyden jar is a device for storing electric charge invented in 1745 by Pieter van Musschenbroek (17001748). Mr. Muschenbroek's bottle is referred to as the "phial" by Benjamin Franklin. Today, we would call it a capacitor. http://nsdl.org Charging by Induction Quiz Does the diagram below illustrate permanent or temporary charging by induction? Step I Step I I Step I I I Step IV Permanent Temporary Electroscope
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
LO'sDetermine the electric potential in the vicinity of one or more point charges Calculate the electrical work done on a charge use conservation of energy to determine the speed of a charge that moves through a specified potential difference.1/30/12 Ai
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Electric CircuitsAP Physics BAim: What is electric current and electrical resistance?LO Calculate current List factors that affect resistivity Calculate resistancePotential Difference =Voltage=EMFIn a battery, a series of chemical reactions occur i
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Magnetic Fields and ForcesAP Physics BAim: How do we calculate magnetic forces?LO's Calculate the magnitude and direction of the force in terms of q, v, and, B, Describe the paths of charged particles moving in uniform magnetic fields.Facts about Magn
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
ElectroMagnetic InductionAP Physics BAim: What is electromagnetic induction?LO's Calculate the flux of a uniform magnetic field through a loop. Recognize situations in which changing flux through a loop will cause an induced emf or current in the loop.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Waves and SoundAP Physics BAim: What are wave properties?Objectives a) Sketch wave graphs and determine the amplitude, wavelength, and frequency b) Relate wavelength, frequency, and velocity for a wave. c) Explain the Doppler effect for sound. d) Descr
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
An Example of Resonance Pendulum A is set in motion The others begin to vibrate due to the vibrations in the flexible beam Pendulum C oscillates at the greatest amplitude since its length, and therefore frequency, matches that of AOther Examples of Res
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Refraction and LensesAP Physics BRefractionRefraction is based on the idea that LIGHT is passing through one MEDIUM into another. The question is, WHAT HAPPENS?Suppose you are running on the beach with a certain velocity when you suddenly need to run
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Thin Film InterferenceSoap Film Why Color?iridescence.Reflection and PhasetThin Film InterferenceSome light reflects off top layer, some off bottom layer. If crest meets trough destructive interference If crest meets crest (trough meets trough) cons
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Light, Reflection, &amp; MirrorsAP Physics B Facts about Light Energy It is a form of ElectromagneticIt is a part of the Electromagnetic Spectrum and the only part we can really seeFacts about LightThe speed of light, c, is constant in a vacuum.Light c
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
LensesAP Physics BLenses An application of refractionThere are 2 basic types of lensesA converging lens (Convex) takes light rays and bring them to a point.A diverging lens (concave) takes light rays and spreads them outward.Converging (Convex) Lens
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Special Case Ray DiagramsAP Physics BWhat if the object is ON &quot;f &quot; ?f If the object is ON the focal point, no image is produced as there is NO intersection. fCfPrincipal axisConverging Lens Inside of &quot;f &quot;ffWhen object is inside of &quot;f&quot;, extend th
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Clicker Question ConcepTests PRS-Enabled Chapter 2 Physics, 3rd Edition James S. Walker 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and asse
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 20Chapter 3 Worksheet1. Determine the force required to accelerate a 20kg cart from rest to 0.50m/s in 2.0s. (5.0N) 2. Film Fhysics! In the 1978 movie &quot;Superman,&quot; there is a scene where Lois Lane falls from a helicopter crash at the top of a bui
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Clicker Question ConcepTests PRS-Enabled Chapter 5 Physics, 3rd Edition James S. Walker 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and asse
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Clicker Question ConcepTests PRS-Enabled Chapter 6 Physics, 3rd Edition James S. Walker 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and asse
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
1) Connect the BatteryWhich is the correct way to light the lightbulb with the battery? 4) all are correct 5) none are correct1)2)3)1) Connect the BatteryWhich is the correct way to light the lightbulb with the battery? 4) all are correct 5) none ar
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Unit 6: Electrostatics Concept Review1) Electric Charge ITwo charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? 1) one is positive, the other is negative 2) both are positive 3) both are negative
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
1) Magnetic Force IA positive charge enters a uniform magnetic field as shown. What is the direction of the magnetic force? 1) 2) 3) 4) 5) out of the page into the page downwards to the right to the leftx x x x x x v x x x x x x x x x x x x q1) Magneti
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Chapter 2Q1 Which position-versus-time graph represents the motion shown in the motion diagram?(1)(2)(3)(4)(5)Q2Which velocity-versus-time graph goes with this position-versus-time graph on the left?(1)(2)(3)(4)Q3 Which position-versus-time g
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electric Circuits Review Assignment Key Formulae:I= Q tName:V = IRVterminal = IrP = VI0108 1.2.3.0106 4.0108 5. A 12 V battery transfers 33 C of charge to an external circuit in 7.5 s. a) What current flows through the circui
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electric Circuits Review Assignment Key Formulae:I= Q tName:V = IRVterminal = IrP = VI0108 1.2.3.0106 4.0108 5. A 12 V battery transfers 33 C of charge to an external circuit in 7.5 s. a) What current flows through the circui
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electrostatics Assignment Key Formulae:F=k Q1Q2 r2Name:E=F Q V d kQ rE=kQ r2V =EP Q Q1Q2 rE=Ep = k 0108 1.V=2.3.4.0106 5.6.7.8.0101 9.10.11.12.0008 13.14.15.16.0006 17.18.19.20.0001 21.22.23.24.9908 2
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electrostatics Assignment Key Formulae:F=k Q1Q2 r2Name:E=F Q V d kQ rE=kQ r2V =EP Q Q1Q2 rE=Ep = k 0108 1.V=2.3.4.0106 5.6.7.8.0101 9.10.11.12.0008 13.14.15.16.0006 17.18.19.20.0001 21.22.23.24.9908 2
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Name: The Ultimate Electromagnetic Forces Assignment (9%) Key Formulae: F = BIl 0108 1. F = QvB B = 0 nI = 0N I l 2. 3. An electron travelling at 7.7 x 106 m/s enters at right angles into a uniform magnetic field.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Name: The Ultimate Electromagnetic Forces Assignment (9%) Key Formulae: F = BIl 0108 1. F = QvB B = 0 nI = 0N I l 2. 3. An electron travelling at 7.7 x 106 m/s enters at right angles into a uniform magnetic field.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 1: Momentum &amp; ImpulseHow does a karate expert chop through cement blocks with a bare hand? Why does a fall onto a trampoline hurt less than onto a cement floor? Why do people in larger vehicles usually end up with fewer injuries in accidents? It's
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Test review#2 Key (advanced Kinematics) Two-body A. Yes, 472.5 &gt; 400 B. 12.5 sec C. 25 seconds (The 20 m/s was to be considered a relative velocity) D. 2.5 sec, 2.25 sec E. 19.6 m Two Dimensional A. 63.9 m, 37.1 m/s B. 75.9 m 7.87 sec, 361.7 m, 60 m/s C.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 5: Elastic and Inelastic CollisionsIf we are dealing with a collision involving really small objects (like atoms or molecules, things that are microscopic) you'll often find that kinetic energy is conserved. The total kinetic energy of all particl
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 6: History &amp; Theories of Static ElectricityAncient TimesIf you ask most people who discovered electricity, they'll probably tell you Benjamin Franklin did. This is because everyone has heard the story of Franklin flying his kite during a lightnin
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 8: VelocityTwo branches in physics examine the motion of objects: Kinematics: describes the motion of objects, without looking at the cause of the motion (kinematics is the first unit of Physics 20). Dynamics: relates the motion of objects to the
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 9: Coulomb's LawCharles Augustin de CoulombBefore getting into all the hardcore physics that surrounds him, it's a good idea to understand a little about Coulomb. He was born in 1736 in Angoulme, France. He received the majority of his higher edu
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 9: d-t &amp; v-t GraphsGraphing the motion of objects gives us a way to interpret the motion that would otherwise be difficult. Graphs will also allow you to show a large amount of information in a compact way. Essentially you need to be able to sketc
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 10: Electric FieldsJust like the force due to gravity, the force due to electric charges can act over great distances. Keep in mind that most forces we deal with in everyday life are not like this. We mostly deal with &quot;contact forces&quot;. objects tou
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 12: GravityAristotleFrom the time of Aristotle (384-322 BC) until the late 1500's, gravity was believed to act differently on different objects. This was based on Aristotle's observations of doing things like dropping a metal bar and a feather at
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 12: Electric Potential Energy &amp; VoltageGravitational Potential EnergyTo better understand electric potential energy it is a good idea to first review gravitational potentialenergy and figure out similarities between them. Understanding the para
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 13: Vectors in One DimensionUp to this point we have been focusing on the number crunching sort of questions you can do in physics. In this chapter the focus will start to be shifted toward more complicated problems that might notalways be solve
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 13: Voltage in a Uniform FieldMost of the time if we are doing experiments with electric fields, we use parallel plates to ensure thatthe field is uniform (the same everywhere). This carries over to our study of voltage. If we use parallel plate
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 14: Vectors in Two DimensionsTwo dimensional problems are a little tougher, because we are no longer just lining up collinear vectorsand doing quick math. Instead, we need to pay attention to how the vectors form a more complex (but not verycom
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 21: Free Body DiagramsFree Body DiagramsWe will need a way to organize forces that are acting on a particular object. The easiest way to do this isby using a free body diagram. A free body diagram is just a simple sketch of the object showing a
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 22: Net ForceThe net force is the vector sum of all the forces acting on anobject. If the forces are parallel we can just add themtogether as positive and negative forces. If the forces are at an angle we have to add them ascomponents of vect
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 23: Newton's First Law (Inertia)Newtons Laws of Motion, as written in his book the Principia, are actually very difficult to read. At the time, Newton didnt care too much about the readability of his book. He just wanted toget the stuff put down
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 24: Newton's Second Law (Motion)To really appreciate Newtons Laws, it sometimes helps to see how they build on each other. The First Law describes what will happen if there is no force. The Second Law describes what will happen if there is a for
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 25: Newton's Third Law (Action-Reaction)Newton came up with one more law when he started thinking about the interaction of objects. He had already talked about what happens when there is no force (1st Law). He then talked about what happens when
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 26: FrictionFriction is a force that always exists between any two surfaces in contact with each other. There is no such thing as a perfectly frictionless environment. Even in deep space, bits of micrometeorites will hit a moving object, causing
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 27a: Torque (AP Only)Torque BasicsTorque is a concept that is very closely related to the ideas we've been developing about force.Just like force is a push or a pull on an object, torque is aWe will only discuss rigid objects in ourtwist.stud
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 27: Gravity on Inclined PlanesYou need to be especially careful when you are doing problems involving gravity pulling somethingdown a slope. The physics involved is considerably more complex than it might first seem, mostly becauseeverything is
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 29: Newton's Law of Universal GravitationLet's say we start with the classic apple on the head version of Newton's work. Newton started with the idea that since the Earth is pulling on the apple, the apple must also bepulling on the Earth (Newto
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 42a: Kinetic Theory of Ideal GasesThe TheoryThe kinetic theory of ideal gases is one of those rare things in physics. it makes sense!Basically, from the point you started to learn about gases in elementary school, you werelearning about the bas
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 42b: First Law of ThermodynamicsThe First Law of Thermodynamics can be stated in several ways.At this point in the course we need to focus on what it says about energy, and gases in thekinetic theory of ideal gases.We will look at how adding he
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 42c: PV DiagramsFrom the last section, you were probably wondering what happens when we do something like add heatto a sealed cylinder.This sounds like a pretty dangerous idea if you think back to the WHMIS training you hadabout compressed gas
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 42d: Second Law of Thermodynamics &amp; EntropyThe Second Law of ThermodynamicsIf you take a can of Dr Pepper out of the fridge and walk outside on a hot summer day, you expect thedrink to get warmer as time passes. You would never expect it to get
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 54: Fluids (AP Only)FluidsThe word fluid will most often make people think about some kind of liquid. The four states of matterare solid, liquid, gas, andIn physics, fluid can refer to either a gas or a liquid.plasma. Of these four, gasesand
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 55: Archimedes' Principle (AP Only)Archimedes of Syracuse is probably one of the most important scientists andmathematicians of all time.Although he lived over 2200 years ago, he was able to make somefundamental discoveries in the study of phys
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 56: Pressure (AP Only)Although we don't think about it, we live at the bottom of a roughly 100 km deep sea of air.Air is made of molecules, so it has mass. Under the effect of gravity, it quite literally weighsdown on us every single moment of o
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 57: Pascal's Principle (AP Only)Imagine that you have a container of fluid.From what we've ;earned so far, we know that the pressure the fluid exerts on the sides of thecontainer are the same everywhere. If they were not, the fluid would no lon
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 58: Pressure in Static Fluid Columns (AP Only)If you've ever done any deep diving underwater, you'll know about the effects it has on your body.Most people get the basic idea that as you go deeper underwater, the pressure increases. It's whyit i
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 59: Principle of Continuity (AP Only)We've spent a lot of time so far looking at hydrostatics, fluids at rest.Even when we looked at problems with moving fluids (like Pascal's Principle), you would notdescribe the fluid as flowing, like water th
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 60: Bernoulli's Equation (AP Only)Bernoulli's Equation looks at the pressure at two different locations for a moving fluid.It is really intimidating when you first see it, but it's not as bad as it might look.11P 1 g y 1 v 2= P 2 g y 2 v 212
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Momentum &amp; Energy Extra Study QuestionsShort Answer1. What is the momentum of a 1000 kg car moving at 15 m/s [E]?2. Calculate the momentum of each of the following objects.(a) a 0.50 kg ball thrown upward with a velocity of 30 m/s(b) a 2000 kg railwa
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