Brainscape's Knowledge GenomeTM

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


See full index

Electrostatics > Electrostatics > Flashcards

Electrostatics Flashcards

1
Q

What is a proton?

A

Positively charged

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

What is a electron?

A

Negatively charged

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

What is a neutron?

A

Neutrally charged

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

Objects are charged by….

A

Adding or removing electrons (not protons).

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

When does the positive charge occur?

A

When there are fewer electrons than protons.

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

When does the negative charge occur?

A

When there are more electrons than protons.

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

Opposite charges…

A

Attract

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

Like charges…

A

Repel

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

What is the Law of Conservation of Electrical Charge?

A

If one region or object acquires a positive charge, then an equal amount of negative charge will be found in neighboring regions or objects.

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

Law of Conservation of Electrical Charge’s net amount

A

The net (sum) amount of electric charge produced in any process is zero

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

What is a conductor?

A

A substance that allows electrons to move easily from one atom to another. Ex: silver, copper, and aluminum.

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

What is an insulator?

A

A substance that does not let electrons to move freely from one atom to another. Ex; plastic, cork, or rubber.

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

1-3 valence electrons

A

Conductor

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

5-8 valence electrons

A

Insulator

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

What is an Electroscope ?

A

An instrument used to detect the presence of an electrostatic charge.

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

2 Types of Electroscope

A

Pith Ball Electroscope and Metal Leaf Electroscope

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

Metal Leaf Electroscope

A

Leaves separate when a charge is present.

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

Charging by Friction

A

Two substances are rubbed together. The electrostatic series indicates the sign of the charge for each of the two substances.

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

Charging by Conduction (Contact)

A

A charged object touches another object; the amount of charge equally divide between the two objects if they have the same geometry. The same sign charge is acquired by each object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Induction

A

A charged is brought near, but not touching, another object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

It has a charge separation (called polarization)

A

Induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

The two objects end up with opposite charges.

A

Induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Polarization

A

Occurs when particles in an insulator realign themselves because a charged object is brought near.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Example: Charging a balloon and sticking it to a wall.

A

Polarization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Coulomb’s Law

A

Calculates the electrostatic force between the two objects.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

1 C = ?

A

6.24x10^18 Electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Equation of Coulomb’s Law

A

Fe = kq1q2/r^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

K

A

Coulomb’s constant, or 9 x 10^9 Nm^2/C^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

q

A

The magnitude (Not the Sign) of charge in coulombs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

r

A

The distance of separation in meters (this distance is always a center to center.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

f

A

The electrostatic force in Newtons. It is either attractive or repulsive.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

The direction of the force is always along a line…..

A

Joining two objects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

If the two objects have the same sign…

A

The force on either object is directed away from each other.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

If the two objects have opposite signs…

A

The force on either object is directed towards each other.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Elementary Charge

A

The charge of either an electron or a proton. The charge of a proton is equal in magnitude to that of an electron, but it’s positive.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

e = 1.6 x 10^-19 C

A

Charge of 1 proton or 1 electron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

What is an electric field?

A

The area around a charged object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

What does the electric field exert?

A

Electrostatic force on any object in its vicinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Electric field lines

A

Electric fields are drawn with vectors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

Line points towards

A

A negative charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

Line points away

A

A positive charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Stronger field

A

More and Closer lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

They NEVER cross

A

Field Lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

The closer the object…

A

The greater the force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

How can we determine if an object has a positive or negative electric charge?

A

We use a test charge (small positive charged object) to determine the direction of an unknown field.

46
Q

The test charge would…

A

Follow the path of the field lines

47
Q

E

A

Electric field strength/intensity (N/C)

48
Q

The force depends only upon the….

A

The magnitude of the point charge producing the field

49
Q

The force does not depend upon the..

A

The value of the test charge

50
Q

What is a Uniform Electric Field?

A

A special situation when 2 charged plates (one positive, one negative) are parallel and evenly spaced.

51
Q

The electric field strength is…

A

The constant between the plates, except the edges.

52
Q

Ee

A

The electric force applied to the charge, in Newtons (N)

53
Q

Fe = qE

A

How we determine the strength (or intensity) of the electric field.

54
Q

What is a magnet?

A

Something that has a magnetic field around it

55
Q

Properties of magnets

A

A magnet has polarity- it has a north and a south pole

56
Q

Compass Needle

A

A suspended bar magnet

57
Q

Un-like poles

A

Attract

58
Q

Like poles

A

Repel

59
Q

Cutting bar magnet in half…

A

It would form smaller magnets

60
Q

Hard Magnets

A

Difficult to magnetize and holds magnetism longer

61
Q

Soft Magnets

A

Easy to magnetize and loses magnetism easily (ex. iron)

62
Q

Permanent Magnets

A

Made of metallic alloys, like iron, nickel, cobalt, etc.

63
Q

Each atom in a material…

A

Acts as a small magnet

64
Q

When all magnets are randomly aligned..

A

There is no net magnetic field

65
Q

When there is no magnetic field…

A

The magnet loses its magnetism

66
Q

Domain theory of magnetism

A

Ferromagnetic materials have atoms that group together in domains.

67
Q

Ferromagnets are substances that are attracted to magnets..

A

Therefore can become a magnet

68
Q

Atoms within each domain line up their…

A

Magnetic fields with neighboring atoms

69
Q

Magnetic fields can cancel

A

Randomly oriented domains

70
Q

When unmagnetized…

A

The domains point in all different directions

71
Q

When magnetized…

A

The domains point in the same direction

72
Q

You can make a temporary magnet by…

A

Forcing the domains to align. By placing a strong magnet next to the ferromagnetic material.

73
Q

You can destroy the magnet and make it lose its magnetic field by:

A

Dropping it or heating it, this forces the domains to become random again

74
Q

What is a magnetic field?

A

The area around a magnet that interacts with other magnetic materials.

75
Q

Magnetic field flows from..

A

North to South (not positive to negative)

76
Q

B

A

Symbol for magnetic field

77
Q

SI

A

Unit for Tesla (T)

78
Q

Can we use a compass for navigation?

A

Yes and No. A compass will usually point in the general direction of geographic north, which would be helpful if you were lost in the woods.

79
Q

Unfortunately, for accurate navigation…

A

Some adjustments are necessary with your compass readings.

80
Q

The problem with Navigating by Compass

A

The Earth’s magnetic poles moves slowly over time

81
Q

Solution #1: Magnetic Declination

A

Angle between the magnetic South Pole and the geographic North Pole.
Maps are based on geographic North Pole because it does not change over time.
Accurate compass measurements require an adjustment to the compass reading using the Magnetic Declination angle.

82
Q

Solution #2: Magnetic Inclination

A

Angle between the horizontal surface of the Earth and the magnetic pole (inside the Earth)
It is measured with a dipping needle.

83
Q

Electricity have?

A

Positive and Negative Charges

84
Q

Eletricity repel when?

A

Like Charges

85
Q

Electricity attracts when?

A

Unlike charges

86
Q

Electricity field lines flow from

A

Postive to Negative

87
Q

Electricity’s Density of lines equals

A

Strength of E

88
Q

Electricity’s SI unit

A

Ampere, 1 A = 1 C/s

89
Q

Electricity’s E exerts force..

A

On a charge (E = F/q)

90
Q

Magnestism have?

A

North and South Poles

91
Q

Magnestism repel when?

A

Like Poles

92
Q

Magnetism attracts when?

A

Unlike poles

93
Q

Magnetic field flow from..

A

North to South

94
Q

Magnetism’s density of lines

A

Equals strength of B

95
Q

Magnetism’s SI unit

A

Tesla, 1 T = 1 N/Axm

96
Q

Magnetism field exerts force…

A

On a moving charge, B = F/(qv)

97
Q

In the early 1800s, scientists knew that there were similarities between the electric fields and magnetic fields, but…

A

Had not discovered any direct relationship between them.

98
Q

Who determines to find the direct relationship between electric and magnetic fields?

A

Hans Christian Oersted

99
Q

How did Christian Oersted determine the direct relationship?

A

He used a battery, a wire, and a compass needle.

100
Q

What did Christian Oersted found?

A

That only an moving current in a wire produced a magnetic field.

101
Q

What did Oersted showed that could not produce a magnetic field?

A

Stationary Electric Charges

102
Q

What can only create a magnetic field?

A

An Electric Current

103
Q

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that….

A

the plastic strip lost electrons to the cotton during the charging process.

104
Q

Your physics teacher has prepared the room for the class’s entry by suspending several inflated balloons from the ceiling. Upon entering the physics room, you observe two balloons being drawn towards each other as shown at the right. The attraction of these balloons for one another provides evidence that ______.

A

at least one of the balloons is charged; the other is either charged or neutral

105
Q

Insulators are different than conductors in that insulators ____.

A

do not allow charge to freely move

106
Q

The leaves of an electroscope are initially apart from each other. When a charged rod is brought near the electroscope, the leaves get closer together.

A

The electroscope is initially charged with the opposite polarity of the rod.

107
Q

A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then

A

positively charged

108
Q

If you comb your hair and the comb becomes negatively charged, your hair becomes

A

positively charged

109
Q

A negatively charged rod is brought near an object. The protons in the object move towards the rod, while the electrons move to the opposite side of the object. The separation of the charges are called_____.

A

polarization

110
Q

Electrical forces between charges are strongest when the charges are

A

close together

111
Q

When the distance between two charges is cut in half, the electrical force between them

A

Quadruple

112
Q

Two parallel plates are oppositely charged. The left plate is negative and the right plate is positive. In which direction does the electric field point?

A

to the left

Electrostatics (1 decks)

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