Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Phys 5B > Ch. 20 > Flashcards

Ch. 20 Flashcards

1
Q

how are charges and electric fields related

A

charges create an electric field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

when is an object neutral

A

when it has equal amounts of positive and negative charges

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

when does an object become negatively charged

A

when the amount of negative charge on it exceeds the amount of positive charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

when does an object become positively charged

A

when it has more positive charge than negative charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what type of force is the force between two particles

A

they are action-reaction pair that are equal in magnitude and opposite in direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

if you increase the distance between two objects what happens?

A

the force decreases (inversely proportional to the square of the distance)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

if you decrease the charge on two objects what happens to the force between them

A

it decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what do we use coulomb’s law for

A

we use it to calculate the force between two charged objects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is charge an inherent property of?

A

electrons and protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

a neutral macroscopic object has how many protons and electrons

A

the same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

how are protons and electrons similar

A

they have the same exact (opposite) charge despite the electron being less massive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

how do objects gain a positive charge

A

by losing electrons (valency)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is ionization

A

it is the process of removing an electron from the electron cloud of an atom to produce a positive ion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is an insulator

A

electrons are tightly bound to the positive nuclei within and are not free to move around, electric charge cannot pass through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is a conductor

A

In metals, the outer electrons (valence) are weakly bound and can detach from their parent ion and can move through the solid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is an electric dipole

A

an electric dipole is equal but opposite charges with a separation between them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is the field model

A

it explains how the force due to charges is transmitted through empty space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

when Charge B experiences a force from charge A, what is actually the agent?

A

the alteration of space around a charge is the agent that exerts a force on charge B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

which way does an electric force point on a positive charge?

A

it points away from it. . For example, if a positive source charge generates an electric field that points away from it, then a positive test charge placed in the field will feel a force in the same direction, away from the source charge.

20
Q

which way does an electric field force vector point on a negative charge

A

it points towards it, a positive charge placed in the electric field of a negative charge would feel a force vector towards the negative charge

21
Q

how do you draw an electric field vector?

A

you draw it tangent to the electric field line

22
Q

where is an electric field stronger?

A

it is stronger where the electric field vectors are longer and closer together

23
Q

the electric field at any point is the

A

vector addition of the individual fields

24
Q

what are the rules for drawing electric field lines

A

draw the field lines starting on the positive charges and moving toward the negative charges

make the lines close together where the field is stronger

25
Q

what is true of the electric field in a parallel plate capacitor

A

the electric field at every point is the same in strength and direction (this is the uniform electric field)

26
Q

what does the electric field in a parallel play capacitor depend on?

A

It depends on the charge and area of the plates

27
Q

what does it mean when a conductor is in electrostatic equilibrium

A

no charges are moving

28
Q

when a conductor is in electrostatic equilibirum, what is true about the electric field?

A

it is zero

29
Q

what happens to the excess charge in a conductor at estatic equilibrium?

A

the charge moves to the surface and the electric field is perpendicular to the surface

30
Q

where is the electric field stronger in a conductor?

A

at sharp points the density of the charge is higher

31
Q

If you place a charged object next to an uncharged object that is a conductor,

A

There is an attractive force between the two objects.

32
Q

A negatively charged rod is brought near a neutral metal sphere. Which of the following is true?

A

There is an attractive force between the rod and sphere.

33
Q

A neutral object __________.

A

has no net charge

34
Q

According to Coulomb’s law, when the distance between two point charges doubles, what happens to the electric force acting between the charges?

A

It goes down by a factor of 4.

35
Q

Electric fields exist ____________.

A

at all points in space around charges

36
Q

The clothes are charged by ______
in the drier. Your body is neutral but the clothes can ______
you a little and attract the opposite charge in your body.

A

rubbing; polarize

37
Q

is glass and plastic a conductor or insulator

A

it is a insulator

38
Q

is metal a conductor or insulator

A

it is a conductor

39
Q

can insulators and conductors be charged?

A

yes they can be charged but they differ in their abiltiies to move

40
Q

is the force between a charged object and a neutral object attractive or repulsive?

A

it is attractive due to polarization

41
Q

if an object is charged, what is true about the electrons and protons

A

there is a difference between them

42
Q

if you rub silk, saran wrap, or polyester on glass, what happens to the charge on the glass?

A

glass tends to lose electrons so it becomes positive while the silk, wrap, or polyester gains those electrons

43
Q

if you rub a PVC or rubber rod on wool, hair, or nylon, what happens to the charge on the rod?

A

PVC tends to gain electrons so it will become negative while the other materials become positive

44
Q

what is grounding

A

it is the ability to absorb positive or negative charges

45
Q

what direction does the electric force on a negative charge point if the electric field is down?

A

if the electric field is down, the force acting on the charge is opposite so it is pointing up

46
Q
A

Phys 5B (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions