PHYSICS  CLUTCH CH 24: CAPACITORS & DIELECTRICS.


 Christiana Wheeler
 3 years ago
 Views:
Transcription
1 !!
2 CONCEPT: CAPACITORS AND CAPACITANCE A CAPACITOR is formed by two surfaces of equal/opposite charge brought close together  Separation of charge potential energy stored Connecting a capacitor to a battery produces a simple CIRCUIT  Motivation for charges to move comes from a  A BATTERY is a good provider Whenever a SINGLE capacitor is connected to a SINGLE battery:  Voltage of battery voltage of capacitor  CHARGE on capacitor Q = CV CAPACITANCE measures the Larger the capacitance, the [ LARGER / SMALLER ] the charge stored CAPACITANCE is defined as C =  Units are F (Farads) EXAMPLE: What is the charge on the capacitor in the following figure? 9 V 3 F Page 2
3 CONCEPT: PARALLEL PLATE CAPACITORS Capacitance for ANY Capacitor is C = Q / V Capacitance for a PARALLEL PLATE Capacitor is C =  Where A is area, d is distance between plates, ε F m Remember:  Electric Field BETWEEN plates is.  Electric Field OUTSIDE plates is.  The magnitude of the UNIFORM Field is Equipotential surfaces between plates: +Q Q EXAMPLE: A parallel plate capacitor has an area of 5 cm 2, a plate separation of 10 mm, and a voltage across the plates of 100 V. What is the charge of the capacitor? Page 3
4 PRACTICE: CAPACITANCE OF PARALLEL CIRCULAR PLATES Two circular plates of radius 2cm are brought together so their separation is 5mm. What is the capacitance of these plates? EXAMPLE: POINT CHARGE IN CAPACITOR Two 1 cm by 1 cm plates, separated by 10 mm, form a capacitor. If each plate is charged to 30 nc, (a) What is the potential difference between the plates? (b) What is the electric field between the plates? (c) How much energy does it take to move a 5 nc charge from the positive plate to the negative plate? PRACTICE: CHARGING A CAPACITOR A 3 F capacitor is given a potential difference across its plates of 10 V. What is the charge built up on its plates? If the source of the potential difference across the plates is removed, but the plates maintain their charge, what is the new potential difference across the capacitor if the distance between the plates is doubled? Page 4
5 CONCEPT: ENERGY STORED BY CAPACITOR Remember: Capacitors separate charges, and this separation leads to potential energy stored. But HOW MUCH energy? Energy stored by capacitor U  Remember that Q = CV ENERGY DENSITY ( ) = Energy per unit volume  Volume of a parallel plate capacitor = EXAMPLE: Two parallel plates of area 50 cm 2, with a separation of 10 mm, have a voltage across them of 20 V. What is the energy stored? The energy density? EXAMPLE: What electric field strength would store 2.5 mj of energy per cubiccentimeter? Page 5
6 PRACTICE: DEFIBRILLATOR A cardiac defibrillator can be modeled as a parallel plate capacitor. When it is charged to a voltage of 2 kv, it has a stored energy of 1 kj. What is the capacitance of the defibrillator? PRACTICE: ENERGY RELEASED BY FLASHBULB Typically, a flashbulb will have a capacitance of 1000 mf. If the bulb were charged to a voltage of 500 V, how much energy is released when the flash goes off, if the bulb loses 80% of its charge in a single flash? Page 6
7 EXAMPLE: SPHERICAL CAPACITOR (USING CALCULUS) What is the capacitance of two concentric spherical shells, one of radius a and one of radius b, with a < b? Consider the charge on each sphere to be +/ Q. +Q Q a b EXAMPLE: CYLINDRICAL CAPACITOR (USING CALCULUS) What is the capacitance per unit length of two concentric, infinitely long cylindrical shells, one of radius a, and one of radius b, with a < b. Consider the charge on each cylinder to be +/ Q. Page 7
8 CONCEPT: COMBINING CAPACITORS IN SERIES AND PARALLEL In Circuit problems, you will need to COLLAPSE / COMBINE capacitors into a SINGLE capacitor. SERIES CONNECTION PARALLEL CONNECTION  Direct connection  Equivalent Capacitance:  Forms a loop  Equivalent Capacitance: EXAMPLE: What is the equivalent capacitance of the following capacitors? 2 F 1 F 2 F 4 F EXAMPLE: What is the equivalent capacitance of the following capacitors? 1 F 3 F 4 F 2 F Page 8
9 EXAMPLE: EQUIVALENT CAPACITANCE OF 4 CAPACITORS What is the equivalent capacitance of the following combination of capacitors? 2 F 2 F 5 F 3 F PRACTICE: EQUIVALENT CAPACITANCE OF 4 CAPACITORS What is the equivalent capacitance of the following capacitors? 2 F 3 F 2 F 2 F Page 9
10 CONCEPT: SOLVING CAPACITOR CIRCUITS In Circuit problems, you will need to find the CHARGE and VOLTAGE of different Capacitors. SERIES CONNECTION PARALLEL CONNECTION  Equivalent Capacitance:  Equivalent Capacitance:  Share [ CHARGE / VOLTAGE ] with EACH OTHER  Share [ CHARGE / VOLTAGE ] with EQUIVALENT Capacitor  Share [ CHARGE / VOLTAGE ] with EACH OTHER  Share [ CHARGE / VOLTAGE ] with EQUIVALENT Capacitor STEPS for Solving Capacitor Circuits: 1) Collapse down to ONE EQUIVALENT capacitor 2) Find VOLTAGE and CHARGE on Equivalent capacitor 3) Work backwards noting VOLTAGE and CHARGE on EACH capacitor EXAMPLE: What is the charge and voltage of each of the capacitors in the following circuit? 2 F 6 F 1 F 10 V Page 10
11 PRACTICE: FIND CHARGE & VOLTAGE IN ALL CAPACITORS What is charge and voltage across each capacitor below? 2 F 2 F 3 F 10 V EXAMPLE: FIND CHARGE OF ONE CAPACITOR What is the charge on the 3 F capacitor below? 1 F 5 V 3 F 2 F 4 F Page 11
12 PRACTICE: FIND VOLTAGE OF THE BATTERY What is the voltage of the battery below? 1 F 3 F 1 F V =? 3 C 2 F PRACTICE: FIND CHARGE OF CAPACITOR IN A COMPLEX ARRANGEMENT What is the charge on the 5 F capacitor? (hint: be careful with series vs parallel) Page 12
13 CONCEPT: INTRO TO DIELECTRICS Dielectrics [ INCREASE / REDUCE ] electric field strength within capacitors  The ability to reduce field strength = DIELECTRIC CONSTANT, > 1 ( = 1 for vacuum)  Dielectrics increase capacitance How Q, V, U and u change depends on how dielectric is INSERTED into capacitor: CONSTANT CHARGE (Q) CONSTANT VOLTAVE (V)  Q doesn t change  V  U  u  Q  V doesn t change  U  u EXAMPLE: A capacitor is connected to a battery as shown below. What is the charge on the capacitor after a dielectric ( ) is inserted into the capacitor while it is still connected to the battery? 9 V 3 F Page 13
14 EXAMPLE: CAPACITOR WITH A DIELECTRIC A capacitor has a voltage of 100 V when it has a charge of 2 C. A dielectric, with the plates are held at 100 V. What is the new charge of the capacitor?, is inserted into the capacitor while PRACTICE: CIRCULAR PLATE CAPACITOR WITH DIELECTRIC A parallel plate capacitor is formed by bringing two circular plates, of radius 0.5 cm, to a distance of 2 mm apart. The capacitor is made so that it has a dielectric of constant between the plates. When the charge on the capacitor is 3 nc, the voltage of the capacitor is 5000 V. What is the dielectric constant? EXAMPLE: CAPACITORS PARTIALLY FILLED WITH DIELECTRIC What is the new capacitance of the two capacitors that are partially filled with dielectrics shown in the following figure? A A L/2 L/2 d/2 κ d κ d/2 (a) (b) Page 14
15 CONCEPT: HOW DIELECTRICS WORK A DIELECTRIC is an insulating material that can  At the atomic level: Alone In external E Dielectrics [ INCREASE / REDUCE ] electric field strength within capacitors Q +  +Q Page 15
16 CONCEPT: DIELECTRIC BREAKDOWN Dielectric is an insulator charges can t move IDEALLY  In REALITY, charges can move if voltage across insulator is large enough  This is known as DIELECTRIC BREAKDOWN DIELECTRIC STRENGTH = Electrons jump from atom to atom: +Q Q e e Lightning is a common example of dielectric breakdown EXAMPLE: A parallel plate capacitor is filled with air and connected to a power source of 100 V. What is the closest you can put the plates together if dielectric breakdown of air occurs at an electric field of V/m? Page 16
4 pt. (in J) 3.A
Mark Reeves  Physics 22, Fall 2011 1 A point charge of mass 0.0699 kg and charge q = +6.87 µc is suspended by a thread between the vertical parallel plates of a parallelplate capacitor, as shown in the
More informationCapacitance and Dielectrics
Slide 1 / 39 Capacitance and Dielectrics 2011 by Bryan Pflueger Capacitors Slide 2 / 39 A capacitor is any two conductors seperated by an insulator, such as air or another material. Each conductor has
More informationChapter 24 Capacitance and Dielectrics
Chapter 24 Capacitance and Dielectrics 1 Capacitors and Capacitance A capacitor is a device that stores electric potential energy and electric charge. The simplest construction of a capacitor is two parallel
More informationChapter 19 Electric Potential and Electric Field
Chapter 19 Electric Potential and Electric Field The electrostatic force is a conservative force. Therefore, it is possible to define an electrical potential energy function with this force. Work done
More informationCapacitance and capacitors. Dr. Loai Afana
apacitance and capacitors apacitors apacitors are devices that store energy in an electric field. apacitors are used in many everyday applications Heart defibrillators amera flash units apacitors are
More informationCapacitors (Chapter 26)
Capacitance, C Simple capacitive circuits Parallel circuits Series circuits Combinations Electric energy Dielectrics Capacitors (Chapter 26) Capacitors What are they? A capacitor is an electric device
More informationCapacitance and Dielectrics
Chapter 24 Capacitance and Dielectrics PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Goals for Chapter 24 To understand capacitors
More informationPhysics (
Exercises Question 2: Two charges 5 0 8 C and 3 0 8 C are located 6 cm apart At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero
More informationPHYS 241 EXAM #1 October 5, 2006
1. ( 5 points) Two point particles, one with charge 8 10 9 C and the other with charge 2 10 9 C, are separated by 4 m. The magnitude of the electric field (in N/C) midway between them is: A. 9 10 9 B.
More informationChapter 16. Electric Energy and Capacitance
Chapter 16 Electric Energy and Capacitance Electric Potential Energy The electrostatic force is a conservative force It is possible to define an electrical potential energy function with this force Work
More informationChapter 25. Capacitance
Chapter 25 Capacitance 1 1. Capacitors A capacitor is a twoterminal device that stores electric energy. 2 2. Capacitance The figure shows the basic elements of any capacitor two isolated conductors of
More informationPhysics (
Question 2.12: A charge of 8 mc is located at the origin. Calculate the work done in taking a small charge of 2 10 9 C from a point P (0, 0, 3 cm) to a point Q (0, 4 cm, 0), via a point R (0, 6 cm, 9 cm).
More informationElectric Potential Energy Chapter 16
Electric Potential Energy Chapter 16 Electric Energy and Capacitance Sections: 1, 2, 4, 6, 7, 8, 9 The electrostatic force is a conservative force It is possible to define an electrical potential energy
More informationA B C D E. 1 Two charges +Q and 3Q are placed in opposite corners of a square. The work required to move a test charge q from point A to point B is:
Slide 1 / 40 1 Two charges +Q and 3Q are placed in opposite corners of a square. The work required to move a test charge q from point to point is: dependent on the path taken from to directly proportional
More informationPHYS 102 SECOND MAJOR EXAM TERM 011
PHYS 102 SECOND MAJOR EXAM TERM 011 * QUESTION NO: 1 An infinite nonconducting sheet has a surface charge density 0.10*10**(6) C/m**2 on one side. How far apart are equipotential surfaces whose potentials
More informationChapter 24 Capacitance and Dielectrics
Chapter 24 Capacitance and Dielectrics Lecture by Dr. Hebin Li Goals for Chapter 24 To understand capacitors and calculate capacitance To analyze networks of capacitors To calculate the energy stored in
More informationConsider a point P on the line joining the two charges, as shown in the given figure.
Question 2.1: Two charges 5 10 8 C and 3 10 8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
More informationQuestion 1. The figure shows four pairs of charged particles. For each pair, let V = 0 at infinity and consider V net at points on the x axis.
Question 1 The figure shows four pairs of charged particles. For each pair, let V = 0 at infinity and consider V net at points on the x axis. For which pairs is there a point at which V net = 0 between
More informationPhysics Electricity & Opcs Lecture 8 Chapter 24 sec Fall 2017 Semester Professor
Physics 24100 Electricity & Opcs Lecture 8 Chapter 24 sec. 12 Fall 2017 Semester Professor Kol@ck How Much Energy? V 1 V 2 Consider two conductors with electric potentials V 1 and V 2 We can always pick
More informationPhysics 202, Exam 1 Review
Physics 202, Exam 1 Review Logistics Topics: Electrostatics + Capacitors (Chapters 2124) Point charges: electric force, field, potential energy, and potential Distributions: electric field, electric potential.
More information4) A 3.0 pf capacitor consists of two parallel plates that have surface charge densities of 1.0
Quantitative 3) Two parallel plates are separated by 1.0 mm. If the potential difference between them is 2.0 V, what is the magnitude of their surface charge densities? A) 18 nc/m2 4) A 3.0 pf capacitor
More informationAgenda for Today. Elements of Physics II. Capacitors Parallelplate. Charging of capacitors
Capacitors Parallelplate Physics 132: Lecture e 7 Elements of Physics II Charging of capacitors Agenda for Today Combinations of capacitors Energy stored in a capacitor Dielectrics in capacitors Physics
More informationChapter 24: Capacitance and Dielectrics
Chapter 24: Capacitance and Dielectrics When you compress/stretch a spring, we are storing potential energy This is the mechanical method to store energy It is also possible to store electric energy as
More informationPhysics 2401 Summer 2, 2008 Exam II
Physics 2401 Summer 2, 2008 Exam II e = 1.60x1019 C, m(electron) = 9.11x1031 kg, ε 0 = 8.845x1012 C 2 /Nm 2, k e = 9.0x10 9 Nm 2 /C 2, m(proton) = 1.67x1027 kg. n = nano = 109, µ = micro = 106, m
More informationChapter 24: Capacitance and Dielectrics
Chapter 24: Capacitance and Dielectrics When you compress/stretch a spring, we are storing potential energy This is the mechanical method to store energy It is also possible to store electric energy as
More informationDepartment of Physics. PHYS MAJOR 2 EXAM Test Code: 015. Monday 1 st May 2006 Exam Duration: 2hrs (from 6:30pm to 8:30pm)
Department of Physics PHYS1005 MJOR EXM Test Code: 015 Monday 1 st May 006 Exam Duration: hrs (from 6:30pm to 8:30pm) Name: Student Number: Section Number: Version 15 Page 1 1. Each of the four capacitors
More information26 Capacitance and Dielectrics
Green Items that must be covered for the national test Blue Items from educator.com Red Items from the 8 th edition of Serway 26 Capacitance and Dielectrics 26.1 Definition of Capacitance 26.2 Calculating
More informationChapter 20 Electric Potential and Electric Potential Energy
Chapter 20 Electric Potential and Electric Potential Energy 1 Overview of Chapter 20 Electric Potential Energy and the Electric Potential! Energy Conservation! The Electric Potential of Point Charges!
More informationAs we discussed in class, here are the key properties of the topographical map:
Ch21P Page 1 1P22/1P92 Problems (2011) Chapter 21 Electric Potential Friday, January 14, 2011 10:03 AM In the previous chapter we learned about the use of the electric field concept to describe electric
More informationCompiled and rearranged by Sajit Chandra Shakya
1 (a) Define capacitance. [May/June 2005] 1...[1] (b) (i) One use of a capacitor is for the storage of electrical energy. Briefly explain how a capacitor stores energy......[2] (ii) Calculate the change
More informationCOLLEGE PHYSICS Chapter 19 ELECTRIC POTENTIAL AND ELECTRIC FIELD
COLLEGE PHYSICS Chapter 19 ELECTRIC POTENTIAL AND ELECTRIC FIELD Electric Potential Energy and Electric Potential Difference It takes work to move a charge against an electric field. Just as with gravity,
More informationW05D1 Conductors and Insulators Capacitance & Capacitors Energy Stored in Capacitors
W05D1 Conductors and Insulators Capacitance & Capacitors Energy Stored in Capacitors W05D1 Reading Assignment Course Notes: Sections 3.3, 4.5, 5.15.4 1 Outline Conductors and Insulators Conductors as
More informationParallel Plate Capacitor, cont. Parallel Plate Capacitor, final. Capacitance Isolated Sphere. Capacitance Parallel Plates, cont.
Chapter 6 Capacitance and Dielectrics Capacitors! Capacitors are devices that store electric charge! Examples of where capacitors are used include:! radio receivers (tune frequency)! filters in power supplies!
More information104 Practice Exam 12/21/02
104 Practice Exam 12/21/02 1. One mole of a substance contains 6.02 > 10 23 protons and an equal number of electrons. If the protons could somehow be separated from the electrons and placed in separate
More informationPhysics 2220 Fall 2010 George Williams SECOND MIDTERM  REVIEW PROBLEMS
Physics 0 Fall 010 George Williams SECOND MIDTERM  REVIEW PROBLEMS The last four problems are from last years second midterm. Solutions are available on the class web site.. There are no solutions for,
More informationPhysics 202, Exam 1 Review
Physics 202, Exam 1 Review Logistics Topics: Electrostatics (Chapters 2124.6) Point charges: electric force, field, potential energy, and potential Distributions: electric field, electric potential. Interaction
More information5) Two large metal plates are held a distance h apart, one at a potential zero, the other
Promlems 1) Find charge distribution on a grounded conducting sphere with radious R centered at the origin due to a charge q at a position (r,θ,φ) outside of the sphere. Plot the charge distribution as
More informationChapter 18. Circuit Elements, Independent Voltage Sources, and Capacitors
Chapter 18 Circuit Elements, Independent Voltage Sources, and Capacitors Ideal Wire _ + Ideal Battery Ideal Resistor Ideal Capacitor Series Parallel An ideal battery provides a constant potential difference
More informationChapter 25. Capacitance
Chapter 25 Capacitance 25.2: Capacitance: 25.2: Capacitance: When a capacitor is charged, its plates have charges of equal magnitudes but opposite signs: q+ and q. However, we refer to the charge of a
More information13  ELECTROSTATICS Page 1 ( Answers at the end of all questions )
3  ELECTROSTATICS Page ) Two point charges 8 and  are located at x = 0 and x = L respectively. The location of a point on the x axis at which the net electric field due to these two point charges is
More informationF = Q big = c) The electric potential in a certain region of space can be described by the equation: 16y2 (1 + z 2 ) V (x, y, z) = 10x
1) Short Answer (4 points each)(show YOUR WORK) a) A 3.0 nc (positive) charge and a 1.0 nc (negative) charge are located 0.80 m apart from each other. What is the force on the 3.0 nc (positive) charge
More informationEnergy Stored in Capacitors
Energy Stored in Capacitors U = 1 2 qv q = CV U = 1 2 CV 2 q 2 or U = 1 2 C 37 Energy Density in Capacitors (1) We define the, u, as the electric potential energy per unit volume Taking the ideal case
More informationPHYSICS  CLUTCH CALCBASED PHYSICS 1E CH 23: ELECTRIC POTENTIAL.
!! www.clutchprep.com CONCEPT: ELECTRIC POTENTIAL ENERGY If you release 2 charges, they move gain. Where did it come from?  Two charges have a stored energy between them, called  ENERGY CONSERVATION:
More informationCapacitor: any two conductors, one with charge +Q, other with charge Q Potential DIFFERENCE between conductors = V
Physics 2102 Gabriela González Capacitor: any two conductors, one with charge +Q, other with charge Q Potential DIFFERENCE between conductors = V Units of capacitance: Farad (F) = Coulomb/Volt Q +Q Uses:
More information2014 F 2014 AI. 1. Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point? Give reason.
2014 F 1. Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point? Give reason. 2. Figure shows the field lines on a positive charge. Is the work done
More informationAP Physics C Electricity & Magnetism Mid Term Review
AP Physics C Electricity & Magnetism Mid Term Review 1984 37. When lighted, a 100watt light bulb operating on a 110volt household circuit has a resistance closest to (A) 102 Ω (B) 101 Ω (C) 1 Ω (D)
More informationChapter 18 Solutions Set Up: (a) The proton has charge and mass Let point a be at the negative plate and
Chapter 18 Solutions *18.1. Set Up: Since the charge is positive the force on it is in the same direction as the electric field. Since the field is uniform the force is constant is upward is to the right,
More informationNicholas J. Giordano. Chapter 18. Electric Potential. Marilyn Akins, PhD Broome Community College
Nicholas J. Giordano www.cengage.com/physics/giordano Chapter 18 Electric Potential Marilyn Akins, PhD Broome Community College Electric Potential Electric forces can do work on a charged object Electrical
More informationChapter 21 Electric Potential
Chapter 21 Electric Potential Chapter Goal: To calculate and use the electric potential and electric potential energy. Slide 211 Chapter 21 Preview Looking Ahead Text: p. 665 Slide 212 Review of Potential
More informationCHAPTER 18 ELECTRIC POTENTIAL
CHAPTER 18 ELECTRIC POTENTIAL BASIC CONCEPTS: ELECTRIC POTENTIAL ENERGY ELECTRIC POTENTIAL ELECTRIC POTENTIAL GRADIENT POTENTIAL DIFFERENCE POTENTIAL ENERGY 1 h PE = U = mgh Or PE U KE K And U + K = total
More informationwhich checks. capacitance is determined entirely by the dimensions of the cylinders.
4.3. IDENTIFY and SET UP: It is a parallelplate air capacitor, so we can apply the equations of Section 4.. EXEUTE: (a) (b) = ε 0 A d (c) V ab so Q V = so 0 ab V ab 6 Q 0. 48 0 = = = 604 V. 45 0 F 3 d
More informationPhys102 Second Major181 Zero Version Coordinator: Kunwar, S Monday, November 19, 2018 Page: 1
Coordinator: Kunwar, S Monday, November 19, 2018 Page: 1 Q1. A neutral metal ball is suspended by a vertical string. When a positively charged insulating rod is placed near the ball (without touching),
More information1. Short Answer (25 points total)
Physics 116b First Practice Examination Due September 19, 2001 Name: Please circle your section: Section 1 Section 2 Section 3 Section 4 I nstructions This is practice for a one hour, closed book examination.
More informationChapter 26. Capacitance and Dielectrics
Chapter 26 Capacitance and Dielectrics Capacitors Capacitors are devices that store electric charge Examples of where capacitors are used include: radio receivers filters in power supplies to eliminate
More informationA) I B) II C) III D) IV E) V
1. A square loop of wire moves with a constant speed v from a fieldfree region into a region of uniform B field, as shown. Which of the five graphs correctly shows the induced current i in the loop as
More informationPhysics 212. Lecture 7. Conductors and Capacitance. Physics 212 Lecture 7, Slide 1
Physics 212 Lecture 7 Conductors and Capacitance Physics 212 Lecture 7, Slide 1 Conductors The Main Points Charges free to move E = 0 in a conductor Surface = Equipotential In fact, the entire conductor
More informationRoll Number SET NO. 42/1
Roll Number SET NO. 4/1 INDIAN SCHOOL MUSCAT FIRST TERM EXAMINATION PHYSICS CLASS: XII Sub. Code: 04 Time Allotted: Hrs 0.04.018 Max. Marks: 70 General Instructions: 1. All questions are compulsory. There
More informationChapter 17 Electric Potential
Chapter 17 Electric Potential Units of Chapter 17 Electric Potential Energy and Potential Difference Relation between Electric Potential and Electric Field Equipotential Lines The Electron Volt, a Unit
More informationGeneral Physics II (PHYS 104) Exam 2: March 21, 2002
General Physics II (PHYS 104) Exam 2: March 21, 2002 Name: Multiple Choice (3 points each): Answer the following multiple choice questions. Clearly circle the response (or responses) that provides the
More informationFísica Básica Experimental I Cuestiones Tema VII. Electrostática. Soluciones incluidas. 1.
1. A cubical surface with no charge enclosed and with sides 2.0 m long is oriented with right and left faces perpendicular to a uniform electric field E of (1.6 10 5 N/C) î. The net electric flux E through
More informationiclicker A metal ball of radius R has a charge q. Charge is changed q >  2q. How does it s capacitance changed?
1 iclicker A metal ball of radius R has a charge q. Charge is changed q >  2q. How does it s capacitance changed? q A: C>2 C0 B: C> C0 C: C> C0/2 D: C> C0 E: C>2 C0 2 iclicker A metal ball of
More informationAgenda for Today. Elements of Physics II. Capacitors Parallelplate. Charging of capacitors
Capacitors Parallelplate Physics 132: Lecture e 7 Elements of Physics II Charging of capacitors Agenda for Today Combinations of capacitors Energy stored in a capacitor Dielectrics in capacitors Physics
More informationCapacitance. Chapter 21 Chapter 25. K = C / C o V = V o / K. 1 / Ceq = 1 / C / C 2. Ceq = C 1 + C 2
= Chapter 21 Chapter 25 Capacitance K = C / C o V = V o / K 1 / Ceq = 1 / C 1 + 1 / C 2 Ceq = C 1 + C 2 Copyright 252 Capacitance 25.01 Sketch a schematic diagram of a circuit with a parallelplate capacitor,
More informationPhysics 202 Midterm 1 Practice Exam
Physics 202 Midterm 1 Practice Exam Name: Student ID: Section: TA (please circle): Daniel Crow Scott Douglas Yutao Gong Taylor Klaus Aaron Levine Andrew Loveridge Jason Milhone Hojin Yoo Instructions:
More informationDefinition of Capacitance
Definition of Capacitance The capacitance, C, of a capacitor is defined as the ratio of the magnitude of the charge on either conductor to the potential difference between the conductors Q C = ΔV The SI
More informationPotentials and Fields
Potentials and Fields Review: Definition of Potential Potential is defined as potential energy per unit charge. Since change in potential energy is work done, this means V E x dx and E x dv dx etc. The
More informationPotential from a distribution of charges = 1
Lecture 7 Potential from a distribution of charges V = 1 4 0 X Smooth distribution i q i r i V = 1 4 0 X i q i r i = 1 4 0 Z r dv Calculating the electric potential from a group of point charges is usually
More informationChapter 26. Capacitance and Dielectrics
Chapter 26 Capacitance and Dielectrics Circuits and Circuit Elements Electric circuits are the basis for the vast majority of the devices used in society. Circuit elements can be connected with wires to
More informationSolution to Quiz 2. April 18, 2010
Solution to Quiz April 8, 00 Four capacitors are connected as shown below What is the equivalent capacitance of the combination between points a and b? a µf b 50 µf c 0 µf d 5 µf e 34 µf Answer: b (A lazy
More informationPhysics 420 Fall 2004 Quiz 1 Wednesday This quiz is worth 6 points. Be sure to show your work and label your final answers.
Quiz 1 Wednesday This quiz is worth 6 points. Be sure to show your work and label your final answers. 1. A charge q 1 = +5.0 nc is located on the yaxis, 15 µm above the origin, while another charge q
More informationStudent ID Number. Part I. Lecture Multiple Choice (43 points total)
Name Student ID Number Part I. Lecture Multiple Choice (43 points total). (5 pts.) The voltage between the cathode and the screen of a television set is 22 kv. If we assume a speed of zero for an electron
More informationSharpen thinking about connections among electric field, electric potential difference, potential energy
PHYS 2015  Week 6 Sharpen thinking about connections among electric field, electric potential difference, potential energy Apply the ideas to capacitance and the parallel plate capacitor For exclusive
More informationChapter 26. Capacitance and Dielectrics
Chapter 26 Capacitance and Dielectrics Capacitors Capacitors are devices that store electric charge Examples of where capacitors are used include: radio receivers filters in power supplies to eliminate
More information(3.5.1) V E x, E, (3.5.2)
Lecture 3.5 Capacitors Today we shall continue our discussion of electrostatics and, in particular, the concept of electrostatic potential energy and electric potential. The main example which we have
More informationAP Physics C  E & M. Slide 1 / 39 Slide 2 / 39. Slide 4 / 39. Slide 3 / 39. Slide 6 / 39. Slide 5 / 39. Capacitance and Dielectrics.
Slide 1 / 39 Slide 2 / 39 P Physics & M apacitance and ielectrics 20151205 www.njctl.org Slide 3 / 39 apacitors capacitor is any two conductors seperated by an insulator, such as air or another material.
More informationPhys222 W16 Exam 2: Chapters Key. Name:
Name: Please mark your answer here and in the scantron. A positively charged particle is moving in the +ydirection when it enters a region with a uniform electric field pointing in the +ydirection. Which
More information5: Capacitors July 8, 2008
5: Capacitors July 8, 2008 5.1 Definition A capacitor is a structure which has a certain capacity to hold an electric charge. It is essentially the simplest possible battery. The typical example of a capacitor,
More informationPHYSICS 241 TEST 1 Monday, February 17, 2003
PHYSICS 241 TEST 1 Monday, February 17, 2003 This 15question test (each question is worth approximately 6.67 points) is worth 100 points, each question is weighted equally. Please fill out the answer
More informationChapter 10. Electrostatics
Chapter 10 Electrostatics 3 4 AP Physics Multiple Choice Practice Electrostatics 1. The electron volt is a measure of (A) charge (B) energy (C) impulse (D) momentum (E) velocity. A solid conducting sphere
More informationPHYSICS  CLUTCH CH 23: ELECTRIC POTENTIAL.
!! www.clutchprep.com CONCEPT: ELECTRIC POTENTIAL ENERGY If you release 2 charges, they move gain. Where did it come from?  Two charges have a stored energy between them, called  ENERGY CONSERVATION:
More informationChapter 26. Capacitance and Dielectrics
Chapter 26 Capacitance and Dielectrics Capacitors Capacitors are devices that store electric charge Examples of where capacitors are used include: radio receivers filters in power supplies energystoring
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 7 Electrostatics and electrodynamics Capacitance and capacitors capacitors with dielectrics Electric current current and drift speed resistance and Ohm s law http://www.physics.wayne.edu/~apetrov/phy2140/
More informationCan current flow in electric shock?
Can current flow in electric shock? Yes. Transient current can flow in insulating medium in the form of time varying displacement current. This was an important discovery made by Maxwell who could predict
More informationAgenda for Today. Elements of Physics II. Capacitors Parallelplate. Charging of capacitors
Capacitors Parallelplate Physics 132: Lecture e 7 Elements of Physics II Charging of capacitors Agenda for Today Combinations of capacitors Energy stored in a capacitor Dielectrics in capacitors Physics
More informationEndofChapter Exercises
EndofChapter Exercises Exercises 1 12 are primarily conceptual questions designed to see whether you understand the main concepts of the chapter. 1. (a) If the electric field at a particular point is
More informationCapacitance & Capacitors, Energy Stored in Capacitors Challenge Problems
Problem 1: Capacitance & Capacitors, Energy Stored in Capacitors Challenge Problems A parallelplate capacitor is charged to a potential V 0, charge Q 0 and then disconnected from the battery. The separation
More informationCapacitance and Dielectrics. Chapter 26 HW: P: 10,18,21,29,33,48, 51,53,54,68
Capacitance and Dielectrics Chapter 26 HW: P: 10,18,21,29,33,48, 51,53,54,68 Capacitors Capacitors are devices that store electric charge and energy Examples of where capacitors are used include: radio
More informationReview. Spring Semester /21/14. Physics for Scientists & Engineers 2 1
Review Spring Semester 2014 Physics for Scientists & Engineers 2 1 Notes! Homework set 13 extended to Tuesday, 4/22! Remember to fill out SIRS form: https://sirsonline.msu.edu Physics for Scientists &
More informationCapacitor Construction
Capacitor Construction Topics covered in this presentation: Capacitor Construction 1 of 13 Introduction to Capacitors A capacitor is a device that is able to store charge and acts like a temporary, rechargeable
More information7. A capacitor has been charged by a D C source. What are the magnitude of conduction and displacement current, when it is fully charged?
1. In which Orientation, a dipole placed in uniform electric field is in (a) stable (b) unstable equilibrium. 2. Two point charges having equal charges separated by 1 m in distance experience a force of
More informationChapter 17. Potential and Capacitance
Chapter 17 Potential and Capacitance Potential Voltage (potential) is the analogue of water pressure while current is the analogue of flow of water in say gal/min or Kg/s Think of a potential as the words
More informationChapter 2: Capacitors And Dielectrics
hapter 2: apacitors And Dielectrics 2.1 apacitance and capacitors in series and parallel L.O 2.1.1 Define capacitance and use capacitance apacitor is a device that is capable of storing electric charges
More informationPhys102 Second Major133 Zero Version Coordinator: A.A.Naqvi Tuesday, August 05, 2014 Page: 1
Coordinator: A.A.Naqvi Tuesday, August 05, 2014 Page: 1 Q1. igure 1 shows four situations in which a central proton (P) is surrounded by protons or electrons fixed in place along a halfcircle. The angles
More informationThe third charge has to be along the line joining the two charges, outside the two charges, and closer to the weaker.
Coordinator: Dr. M.F.AlKuhaili Thursday, uly 30, 2015 Page: 1 Q1. Two point charges q and 4q are at x = 0 and L, respectively. A third charge q is to be placed such that the net force on it is zero. What
More information(21/703) At what distance from a point charge of 8µC would the potential equal 3.6X10 4 V?
(/73) At what distance from a point charge of 8µC would the potential equal 3.6X 4 V? (6/73) A positron has the same charge as a proton but the same mass as an electron. Suppose a positron moves 5. cm
More informationCapacitance, Resistance, DC Circuits
This test covers capacitance, electrical current, resistance, emf, electrical power, Ohm s Law, Kirchhoff s Rules, and RC Circuits, with some problems requiring a knowledge of basic calculus. Part I. Multiple
More informationC = V Q. To find the capacitance of two conductors:
Capacitance Capacitance is a measure of the ability of two conductors to store charge when a given potential difference is established between them. Two conductors, on one of which is charge +Q and on
More informationDielectrics. Chapter 24. PowerPoint Lectures for University Physics, Twelfth Edition Hugh D. Young and Roger A. Freedman. Lectures by James Pazun
Chapter 24 Capacitance and Dielectrics PowerPoint Lectures for University Physics, Twelfth Edition Hugh D. Young and Roger A. Freedman Lectures by James Pazun Main Points 1. Equipotential ti regions (lines,
More informationElectrostatic Potential and Capacitance Examples from NCERT Text Book
Electrostatic Potential and Capacitance Examples from NCERT Text Book 1. (a) Calculate the potential at a point P due to a charge of 4 10 located 9 cm away. (b) Hence obtain the done in bringing a charge
More informationPractice Exam 1. Necessary Constants and Equations: Electric force (Coulomb s Law): Electric field due to a point charge:
Practice Exam 1 Necessary Constants and Equations: Electric force (Coulomb s Law): Electric field due to a point charge: Electric potential due to a point charge: Electric potential energy: Capacitor energy:
More information