Ch 18 Electric Charge and Force Understand the basic properties of charge Know that the magnitude of the charge on a proton is exactly equal to the magnitude of the charge on an electron be able to use the elementary charge ID: 458853
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AP Physics 1 Review Ch 18 – Electric Charge and Force
Understand the basic properties of chargeKnow that the magnitude of the charge on a proton is exactly equal to the magnitude of the charge on an electron; be able to use the elementary charge () in calculationsUnderstand the basic properties of insulators and conductorsUnderstand charge polarization in both insulators and conductors Understand charging a conductor by conduction and inductionUnderstand the transfer of charge between spherical conductors of equal size Understand how charge is distributed on a conductor in electrostatic equilibriumUnderstand Coulomb’s law () and its similarities and differences with Newton’s Universal law of gravitation () Be able to apply Coulomb’s law () law to force problemsBe able to determine the magnitude and direction of the net electric force on a charged particle due to other charged particlesBe able to determine the magnitude and direction of the acceleration of a charged particle due to a net electrical force and be able to describe the subsequent motion of the particle
Slide2
A rod attracts a positively charged hanging ball. The rod is
Positive.Negative.Neutral.Either A or C.Either B or C.Slide3
A rod attracts a positively charged hanging ball. The rod is
Positive.Negative.Neutral.Either A or C.Either B or C.Slide4
Consider two objects A and B. Object A has a net charge while B is uncharged. Based on this information, it must be true that
A is a conductor, B is an insulator.A is an insulator, B is a conductor.A and B are both insulators.A and B are both conductor.There’s not enough information to tell.Slide5
Consider two objects A and B. Object A has a net charge while B is uncharged. Based on this information, it must be true that
A is a conductor, B is an insulator.A is an insulator, B is a conductor.A and B are both insulators.A and B are both conductor.There’s not enough information to tell.Slide6
Metal spheres 1 and 2 are touching. Both are initially neutral.
The charged rod is brought near.The charged rod is then removed.The spheres are separated.Afterward, the charges on the sphere are:Q1 is + and Q2 is +Q1 is + and Q2 is –Q1 is – and Q2 is +Q1 is – and Q2 is –Q1 is 0 and Q2 is 0.Slide7
Metal spheres 1 and 2 are touching. Both are initially neutral.
The charged rod is brought near.The charged rod is then removed.The spheres are separated.Afterward, the charges on the sphere are:Q1 is + and Q2 is +Q1 is + and Q2 is –Q1 is – and Q2 is +Q1 is – and Q2 is –Q1 is 0 and Q2 is 0Slide8
Metal spheres 1 and 2 are touching. Both are initially neutral.
The charged rod is brought near.The spheres are separated.The charged rod is then removed.Afterward, the charges on the sphere are:Q1 is + and Q2 is +Q1 is + and Q2 is –Q1 is – and Q2 is +Q1 is – and Q2 is –Q1 is 0 and Q2 is 0Slide9
Net charge is obtained if contact is broken while the spheres are polarized.
This is charging by induction.Metal spheres 1 and 2 are touching. Both are initially neutral.The charged rod is brought near.The spheres are separated.The charged rod is then removed.Afterward, the charges on the sphere are:Q1 is + and Q2 is +Q1 is + and Q2 is –Q1 is – and Q2 is +Q1 is – and Q2 is –Q1 is 0 and Q2
is 0Slide10
Based on the last experiment, where two spheres were charged by induction, we can conclude thatOnly the – charges move.
Only the + charges move.Both the + and – charges move.We can draw no conclusion about which charges move.Slide11
Based on the last experiment, where two spheres were charged by induction, we can conclude thatOnly the – charges move.
Only the + charges move.Both the + and – charges move.We can draw no conclusion about which charges move.Slide12
Identical metal spheres are initially charged as shown.Spheres P and Q are touched together and then separated.
Then spheres Q and R are touched together and separated.Afterward the charge on sphere R is –1 nC or less –0.5 nC0 nC+0.5 nC+1.0 nC or moreSlide13
Identical metal spheres are initially charged as shown.Spheres P and Q are touched together and then separated.
Then spheres Q and R are touched together and separated.Afterward the charge on sphere R is –1 nC or less –0.5 nC0 nC+0.5 nC+1.0 nC or moreSlide14
The charge of sphere 2 is twice
that of sphere 1. Which vector below shows the force of 2 on 1? Slide15
The charge of sphere 2 is twice
that of sphere 1. Which vector below shows the force of 2 on 1?
Newton
’s third lawSlide16
The charge of sphere 2 is twice that of sphere 1. Which vector below shows the force of 1 on
2 if the distance between the spheres is reduced to r/2? None of the above. Slide17
The charge of sphere 2 is twice that of sphere 1. Which vector below shows the force of 1 on
2 if the distance between the spheres is reduced to r/2? None of the above.
At half the distance, the force is
fourtimes as large:Slide18
Which of the three right-hand charges experiences the largest force?
q 2q 4q q and 2q are tied q and 4q are tiedSlide19
Which of the three right-hand charges experiences the largest force?
q 2q 4q q and 2q are tied q and 4q are tiedSlide20
In each of the following cases, an identical small, positive charge is placed at the black dot. In which case is the force on the small charge the largest? Slide21
In each of the following cases, an identical small, positive charge is placed at the black dot. In which case is the force on the small charge the largest?
.CSlide22
In each of the following cases, an identical small, positive charge is placed at the black dot. In which case is the force on the small charge the largest? (All charges shown are of equal magnitude.) Slide23
In each of the following cases, an identical small, positive charge is placed at the black dot. In which case is the force on the small charge the largest? (All charges shown are of equal magnitude.)
ASlide24
Which is the direction of the net force on the
charge at the lower left?None of these.Slide25
Which is the direction of the net force on the
charge at the lower left?None of these.B.Slide26
Which is the direction of the net
force on the charge at the top?None of these.Slide27
Which is the direction
of the net force on the charge at the top?None of these.D.Slide28
The direction of the force on charge –q is
UpDownLeftRightThe force on –q is zeroSlide29
The direction of the force on charge –q is
UpDownLeftRightThe force on –q is zero.–Q is slightly closer than +Q.