Chapter 16 Electric Charge And Electric Field - MillerSTEM

2y ago
25 Views
2 Downloads
1.43 MB
39 Pages
Last View : 26d ago
Last Download : 6m ago
Upload by : Olive Grimm
Transcription

Chapter 16Electric Charge andElectric Field

16.1 Static Electricity; Electric Chargeand Its ConservationObjects can be charged by rubbing

16.1 Static Electricity;Electric Charge and ItsConservationCharge comes in twotypes, positive andnegative; like chargesrepel and oppositecharges attract

16.1 Static Electricity; Electric Chargeand Its ConservationElectric charge is conserved – thearithmetic sum of the total charge cannotchange in any interaction.

16.2 Electric Charge in the AtomAtom:Nucleus (small,massive, positivecharge)Electron cloud (large,very low density,negative charge)

16.2 Electric Charge in the AtomAtom is electrically neutral.Rubbing charges objects by moving electronsfrom one to the other.

16.2 Electric Charge in the AtomPolar molecule: neutral overall, but charge notevenly distributed

16.3 Insulators and ConductorsConductor:Insulator:Charge flows freelyAlmost no charge flowsMetalsMost other materialsSome materials are semiconductors.

16.3 Insulators and ConductorsTime for a Gizmo!

16.4 Induced Charge; the ElectroscopeMetal objects can be charged by conduction:

16.4 Induced Charge; the ElectroscopeThey can also be charged by induction:

16.4 Induced Charge; the ElectroscopeNonconductors won’t become charged byconduction or induction, but will experiencecharge separation:

16.4 Induced Charge; the ElectroscopeTime for a Gizmo!

16.4 Induced Charge; the ElectroscopeThe electroscopecan be used fordetecting charge:

16.4 Induced Charge; the ElectroscopeThe electroscope can be charged either byconduction or by induction.

16.4 Induced Charge; the ElectroscopeThe charged electroscope can then be used todetermine the sign of an unknown charge.

16.4 Induced Charge; the ElectroscopeTime for a Gizmo!

16.5 Coulomb’s LawExperiment shows that the electric forcebetween two charges is proportional to theproduct of the charges and inverselyproportional to the distance between them.

16.5 Coulomb’s LawCoulomb’s law:(16-1)This equation gives the magnitude ofthe force.

16.5 Coulomb’s LawThe force is along the line connecting thecharges, and is attractive if the charges areopposite, and repulsive if they are the same.

16.5 Coulomb’s LawTime for a Gizmo!

16.5 Coulomb’s LawUnit of charge: coulomb, CThe proportionality constant in Coulomb’slaw is then:Charges produced by rubbing aretypically around a microcoulomb:

16.5 Coulomb’s LawCharge on the electron:Electric charge is quantized in unitsof the electron charge.

16.5 Coulomb’s LawThe proportionality constant k can also bewritten in terms of, the permittivity of freespace:(16-2)

16.5 Coulomb’s LawCoulomb’s law strictly applies only to point charges.Superposition: for multiple point charges, the forceson each charge from every other charge can becalculated and then added as vectors.

16.6 Solving Problems InvolvingCoulomb’s Law and VectorsThe net force on a charge is the vectorsum of all the forces acting on it.

16.6 Solving Problems InvolvingCoulomb’s Law and VectorsVector addition review:

16.7 The Electric FieldThe electric field is theforce on a small charge,divided by the charge:(16-3)

16.7 The Electric FieldFor a point charge:(16-4a)(16-4b)

16.7 The Electric FieldForce on a point charge in an electric field:(16-5)Superposition principle for electric fields:

16.7 The Electric FieldProblem solving in electrostatics: electricforces and electric fields1. Draw a diagram; show all charges, withsigns, and electric fields and forces withdirections2. Calculate forces using Coulomb’s law3. Add forces vectorially to get result

16.8 Field LinesThe electric field can be represented by fieldlines. These lines start on a positive chargeand end on a negative charge.

16.8 Field LinesTime for a Gizmo!

16.8 Field LinesThe number of field lines starting (ending)on a positive (negative) charge isproportional to the magnitude of the charge.The electric field is stronger where the fieldlines are closer together.

16.8 Field LinesElectric dipole: two equal charges, opposite insign:

16.8 Field LinesThe electric field betweentwo closely spaced,oppositely charged parallelplates is constant.

16.8 Field LinesSummary of field lines:1. Field lines indicate the direction of thefield; the field is tangent to the line.2. The magnitude of the field is proportionalto the density of the lines.3. Field lines start on positive charges andend on negative charges; the number isproportional to the magnitude of thecharge.

16.9 Electric Fields and ConductorsThe static electric field inside a conductor iszero – if it were not, the charges would move.The net charge on a conductor is on itssurface.

16.9 Electric Fields and ConductorsThe electric field isperpendicular to thesurface of a conductor –again, if it were not,charges would move.

16.8 Field Lines The electric field between two closely spaced, oppositely charged parallel plates is constant. 16.8 Field Lines Summary of field lines: 1. Field lines indicate the direction of the field; the field is tangent to the line. 2. Th

Related Documents:

Part One: Heir of Ash Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Chapter 11 Chapter 12 Chapter 13 Chapter 14 Chapter 15 Chapter 16 Chapter 17 Chapter 18 Chapter 19 Chapter 20 Chapter 21 Chapter 22 Chapter 23 Chapter 24 Chapter 25 Chapter 26 Chapter 27 Chapter 28 Chapter 29 Chapter 30 .

TO KILL A MOCKINGBIRD. Contents Dedication Epigraph Part One Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Chapter 11 Part Two Chapter 12 Chapter 13 Chapter 14 Chapter 15 Chapter 16 Chapter 17 Chapter 18. Chapter 19 Chapter 20 Chapter 21 Chapter 22 Chapter 23 Chapter 24 Chapter 25 Chapter 26

DEDICATION PART ONE Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Chapter 11 PART TWO Chapter 12 Chapter 13 Chapter 14 Chapter 15 Chapter 16 Chapter 17 Chapter 18 Chapter 19 Chapter 20 Chapter 21 Chapter 22 Chapter 23 .

The Princeton Review Practice SAT Physics Subject Test 1 431 GO ON TO THE NEXT PAGE 27. Four point charges are labeled Charge 1, Charge 2, Charge 3, and Charge 4. It is known that Charge 1 attracts Charge 2, Charge 2 repels Charge 3, and Charge 3 attracts Charge 4. Which

20.1 Electric Charge and Static Electricity The effect an electric charge has on other charges in the space around it is the charge’s electric field. An electric field exerts forces on any charged object placed in the field

F K q 1q 2/r2 (Coulomb's Law) where K depends on the system of units K 8.99x10 9 Nm 2/C 2 (in MKS system) K 1/(4 πε0) where ε0 8.85x10-12 C 2/(Nm 2) Electric Charge : electron charge -e e 1.6x10-19 C proton charge e C Coulomb Electric charge is a conserved quantity (net electric charge is never created or destroyed !) q 1 q 2 r

CHAPTER 21. ELECTRIC CHARGE AND ELECTRIC FIELD Review vector addition, geometry and calculus (differentiation and integration) Four fundamental forces: o Gravitational force involves “mass” o Electromagnetic force involves “electric charge” o Strong force (or Nuclear force) o Weak force A. Electric charge

About the husband’s secret. Dedication Epigraph Pandora Monday Chapter One Chapter Two Chapter Three Chapter Four Chapter Five Tuesday Chapter Six Chapter Seven. Chapter Eight Chapter Nine Chapter Ten Chapter Eleven Chapter Twelve Chapter Thirteen Chapter Fourteen Chapter Fifteen Chapter Sixteen Chapter Seventeen Chapter Eighteen