HW1 return! FERPA-approved military fashion!. Equipotential and field lines: Equipotential lines field lines:

Slides:



Advertisements
Similar presentations
PHYS 222 SI Test Review. A.0.11m B.15.36m C.1.48m D.0.148m E.5.48m.
Advertisements

Chapter 21 Reading Quiz Dr. Harold Williams.
Electric Potential and Field
Electric Potential Electric forces are conservative. Work done by an electric force is W=-q o Ed  U=-W.
Physics 152 Walker, Chapter 20 Electrostatic Potential Energy Electrostatic Potential.
Chapter 21 Electric Potential.
Chapter 21 Electric Field 1. Chapter 21.1 The Electric Field Define an electric field Solve problems relating to charge, electric fields, and forces.
Chapter 24 Capacitance, dielectrics and electric energy storage
Dielectric Materials.
Chapter 17 Electric Potential.
Copyright © 2010 Pearson Education, Inc. Lecture Outline Chapter 20 Physics, 4 th Edition James S. Walker.
Electric Potential Chapter 23 opener. We are used to voltage in our lives—a 12-volt car battery, 110 V or 220 V at home, 1.5 volt flashlight batteries,
Lecture 4 Capacitance and Capacitors Chapter 16.6  Outline Definition of Capacitance Simple Capacitors Combinations of Capacitors Capacitors with.
Capacitance and Dielectrics
17-7 Capacitance A device that stores electric charge Two plates that are separated by an insulator Used in electronic circuits Store charge that can later.
I Chapter 25 Electric Currents and Resistance HW7: Due Monday, March 30; Chap.24: Pb.32,Pb.35,Pb.59 Chap.25: Pb.19,Pb.25,Pb.31.
The energy stored in a parallel plate capacitor is A.equal to the work required to charge it B.½ CV 2 C.equal to the average potential difference multiplied.
3. Capacitance and dielectrics. 3 8 The potential difference between the plates of a 3 μ F capacitor is 100 V. How much energy is stored in.
1 Capacitance and Dielectrics Chapter 27 Physics chapter 27.
When a potential difference of 150 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 30.0 nC/cm2.
Lecture 8 Friday January 30 Capacitors and Review.
Lecture 7 Capacitors. Micro-economists are wrong about specific things, and macroeconomists are wrong about things in general. Yoram Bauman.
(Capacitance and capacitors)
Copyright © 2012 Pearson Education Inc. PowerPoint ® Lectures for University Physics, Thirteenth Edition – Hugh D. Young and Roger A. Freedman Lectures.
Capacitance Physics Department, New York City College of Technology.
Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Electric potential energy Electric potential Conservation of energy Chapter.
Exam next Friday Chapters Closed book Closed notes Calculators OK.
Copyright © 2009 Pearson Education, Inc. Lecture 5 - Capacitance Capacitors & Dielectrics.
Topic 9.3 Electric Field, Potential, and Energy
Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Electric potential energy Electric potential Conservation of energy Chapter.
Chapter 24 Capacitance, Dielectrics, Electric Energy Storage
Capacitance & Dielectrics
Chapter 24 Capacitance, Dielectrics, Electric Energy Storage
Capacitance�and�Dielectrics
Dielectric Materials. What is a dielectric material? E Dielectric materials consist of polar molecules which are normally randomly oriented in the solid.
Copyright © 2009 Pearson Education, Inc. Various Capacitors Chapter 24 : Capacitance & Dielectrics. (in the book by Giancoli). Chapter 26 in our book.
Electric Potential. Electrostatic Potential Energy and Potential Difference The electrostatic force is conservative – potential energy can be defined.
Chapter 17 Electric Potential. Objectives: The students will be able to: Given the dimensions, distance between the plates, and the dielectric constant.
Lecture 8-1 High Electric Field at Sharp Tips Two conducting spheres are connected by a long conducting wire. The total charge on them is Q = Q 1 +Q 2.
1 My Chapter 17 Lecture Outline. 2 Chapter 17: Electric Potential Electric Potential Energy Electric Potential How are the E-field and Electric Potential.
e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- p+p+ p+p+ p+p+ Connecting two parallel plates to a battery produces uniform electric field  the electric.
Electric Energy and Capacitance
Lecture Outline Chapter 16 College Physics, 7 th Edition Wilson / Buffa / Lou © 2010 Pearson Education, Inc.
GENERAL PHYSICS LECTURE Chapter 26 CAPACITANCE AND DIELECTRICS Nguyễn Thị Ngọc Nữ PhD: Nguyễn Thị Ngọc Nữ.
111/16/2015 ELECTRICITY AND MAGNETISM Phy 220 Chapter 4: Capacitors.
1/25/2008 J.Velkovska 1 PHYS117B: Lecture 8 More about electric potential  Equipotential lines  Relation between E and V Capacitance.
Lecture Outline Chapter 16 College Physics, 7 th Edition Wilson / Buffa / Lou © 2010 Pearson Education, Inc.
Chapter 23 Electric Potential. Basics The potential due to an electric dipole is just the sum of the potentials due to each charge, and can be calculated.
Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Electric potential energy Electric potential Conservation of energy Equipotential.
Electrostatics #5 Capacitance. Capacitance I. Define capacitance and a capacitor: Capacitance is defined as the ability of an object to store charge.
Copyright © 2009 Pearson Education, Inc. Chapter 23 Electric Potential.
Key Points Potential is Inversely Proportional to distance Electric Field Strength is Proportional to the Inverse Square of the distance Equipotentials.
An electric force of 4.5 x N is measured between two particles. One particle has a charge of 2.0 x C & the other has a charge of 3.0 x
What charge exists on a 30 μF capacitor (fully charged) with a 120 V potential difference between its plates and what is the energy stored? Ans: 3.6.
Chapter 20 Electric Potential and Electric Potential Energy.
Capacitor Two conductors carrying charges of equal magnitude but opposite sign form a capacitor. +Q -Q A parallel plate capacitor is a particularly common.
Capacitor Device that can store electric charge Two conducting objects are placed near one another but not touching Power source charges up the plates,
Unit 7: Part 2 Electric Potential. Outline Electric Potential Energy and Electric Potential Difference Equipotential Surfaces and the Electric Field.
Capacitors A capacitor is a device that has the ability “capacity” to store electric charge and energy.
Electrostatic Energy and Capacitors. Capacitance An indication as to how easy it is to accumulate charge on an object. Ex. What is the capacitance of.
Chapter 25 Capacitance In this chapter we will cover the following topics: -Capacitance C of a system of two isolated conductors.
Chapter 25 Capacitance In this chapter we will cover the following topics: -Capacitance C of a system of two isolated conductors.
Equipotential Lines Are Topographical Maps
Topic 9.3 Electric Field, Potential, and Energy
Electric Potential and Electrical Field
What charge exists on a 30 μF capacitor (fully charged) with a 120 V potential difference between its plates and what is the energy stored? Ans: 3.6.
General Physics (PHY 2140) Lecture 6 Electrostatics
Chapter 25 Capacitance-II
Conductors.
Chapter 24 Capacitance, Dielectrics, Electric Energy Storage
Presentation transcript:

HW1 return! FERPA-approved military fashion!

Equipotential and field lines: Equipotential lines field lines:

Equipotential lines and the Electric field: Quantitative relation

? Equipotential lines and the Electric field: Quantitative relation

Equipotential lines and the Electric field: Quantitative relation

Small enough scale, looks like parallel plate field: In direction of

Small enough scale, looks like parallel plate field: (calculate) In direction of

Formally: Direction: downhill

Pretending that V(x) is like a topographic map: A)The Electric field always points in the direction of steepest descent! B) The magnitude of the electric field is given by the slope in that direction! alternate units for E : V/m

Estimating Electric field strength:

Something Unrelated ….

Example where’s V = 0? 5 cm Two possibilities!

Example where’s V = 0? 5 cm x Possibility #1

Example where’s V = 0? x Possibility #2

Conductors!

Electric fields just outside of a conductor are strong where the conductor is pointy: Dielectric strength of a material = maximum electric field the Material can stand before breaking down. Dielectric strength of air = 3 × 10 6 V/m Example: Voltage of a 15 cm spark!

Capacitance:

Must be at different potentials!

Capacitance:

Parallel-plate capacitor: 10 cm 0.1 cm Square plates 10 cm

Parallel-plate capacitor: Q = ?

Parallel-plate capacitor: Dielectric constant! 0.1 cm 10 cm Dielectric! Square plates Quartz:  = 4.3

Leyden-jar demo V de G demo again, big and little spheres – spark size