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Physics 130: Lecture Slide (Chapter Review) > Chapter 24: Magnetism > Flashcards

Chapter 24: Magnetism Flashcards

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1
Q

The force between any two charged particles depends on the magnitude of the charge on each and their distance of

A

Separation as specified in Coulomb’s law

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2
Q

When charged particles are moving with respect to each other, the electrical force between electrically charged particles depends also, in a complicated way, on their

A

Motion

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3
Q

There is a force due to the motion of the charged particles that we call the

A

Magnetic force

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4
Q

Force of attraction or repulsion between a pair of magnets depends on

A

Which end of the magnet is held near the other

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5
Q

Magnetic poles behavior similar to

A

Electrical forces

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6
Q

Strength of interaction depends on the distance between the

A

Two magnets

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7
Q

Given rise to magnetic force of the two types interacting with each other:

A

1) North pole
2) South pole

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8
Q

North and South pole

A

North seeking pole and south seeking pole

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9
Q

Rule for magnetic forces between magnetic poles like

A

Poles repels and opposite poles area attract

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10
Q

In all magnets cannot have

A

One pole without the other

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11
Q

No single pole known to

A

Exist

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12
Q

Simple bar magnet

A

Poles at the two ends

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13
Q

Horseshoe magnet

A

Bent U Shape poles at ends

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14
Q

If we continue to split the magnet, we will eventually get down to an iron atom with

A

A north pole and south pole and these cannot be separated

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15
Q

A weak and strong magnet repel each other. The greater repelling force is by the

A

Stronger and weaker magnet

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16
Q

Region of magnetic influence surrounding

A

Magnetic poles and shape revealed by lines that spread from one pole to the other then by convention direction is from the north pole to the south pole

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17
Q

Strength indicated by closeness of the lines

A

1) Line close together (denser); strong magnetic field
2) Lines farther apart (less dense); weak magnetic field

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18
Q

Magnetic field produced by two kinds of electron motion

A

1) Electron pin
2) Electron revolutions

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19
Q

Electron spin main contributor to

A

Magnetism and pair of electrons spinning in same direction creates a stronger magnet and pair of electron spinning in opposite direction cancels magnetic field the other

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20
Q

Electron revolution orbits or energy levels that electrons occupy

A

Around the nucleus of an atom

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21
Q

Magnetized clusters of

A

Aligned magnetic atoms

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22
Q

Permanent magnets made by placing pieces of iron or similar magnetic materials in

A

A strong magnetic field

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23
Q

Stroking material with a magnet to

A

Align the domains

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24
Q

Permanent magnet can be naturally occuring (lodestone) or created by

A

1) Alignment of domains by an external field
2) Domain remain once external magnetic field is removed

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25
Q

Temporary magnet alignment of domains return to

A

Random arrangement once external magnetic field is removed

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26
Q

When a magnet is broken into two pieces, each piece is

A

An equally strong magnet

27
Q

Since a moving charge produces a magnetic field, it follows that a

A

Current of charges also produces a magnetic field

28
Q

Magnetic field forms a pattern of

A

Concentric circles around a current-carrying wire

29
Q

When current reverses direction, the direction of the field lines are

A

Reverse

30
Q

Right hand rule tells us the direction of

A

The B-field

31
Q

Curl hands around the loop in the direction of

A

Current and thumb gives you direction of the B-field

32
Q

Magnetic field lines about a current-carrying wire bunch up when the wire is

A

Bent into a loop

33
Q

Magnetic field intensity increases as the number of loops increases in a

A

Current-carrying coil temporary magnet

34
Q

Electromagnet

A

Iron bar placed in a current carrying coil

35
Q

An electromagnet can be made stronger by increasing the

A

Number of turns of wire and the current in the coil

36
Q

A current carrying coil of wire is

A

An electro magnet

37
Q

The strength of an electromagnet is increased by

A

Increasing the current through the coil and increasing the number of turns in the coil

38
Q

Industrial magnets gain additional strength by

A

Having a piece of iron within the coil

39
Q

Magnetic domains in the iron core are

A

Induced into alignment adding to the field

40
Q

Electromagnets without iron cores are used in

A

Magnetically levitated or maglev transportation

41
Q

Levitation is accomplished by

A

Magnetic coils that run along the track called a guideway

42
Q

The coil repel large magnets on

A

The train’s undercarriage

43
Q

Continually alternating electric current fed to the coils continually alternates their

A

Magnetic polarity, pulling and pushing the train forward

44
Q

Moving charges in a magnetic field experience a

A

Deflecting force

45
Q

Greatest force

A

Particle movement in direction perpendicular to the magnetic field lines

46
Q

Least force

A

Particle movement other than perpendicular to the magnetic field lines

47
Q

No force

A

Particle movement parallel to the magnetic field lines

48
Q

On moving charged particles: A beam of electrons is deflected by

A

A magnetic field

49
Q

Direction is perpendicular to

A

Both magnetic field lines and current perpendicular to wire

50
Q

Strongest when current is

A

Perpendicular to the magnetic field lines

51
Q

The reason that an electron moving in a magnetic field doesn’t pick up speed is

A

The magnetic force is always perpendicular to its motion

52
Q

The magnetic force on a moving charged particle can change the particle’s

A

Direction

53
Q

Earth itself is a huge

A

Magnet

54
Q

The magnetic pole of Earth are widely separated from

A

The geographic poles

55
Q

The magnetic field of Earth is not due to a giant magnet in its interior, it is due to

A

Electric currents

56
Q

Most scientists think that moving charges looping around within the molten part of Earth create

A

The magnetic field

57
Q

Universe is a shooting gallery of charged particles called

A

Cosmic rays

58
Q

They travel through space at fantastic speeds and make up the cosmic radiation that is

A

Hazardous to astronauts

59
Q

Cosmic rays are deflected away from Earth by

A

Earth’s magnetic field

60
Q

Most of the charged particles (protons and electrons) trapped in

A

The outer belt probably come from the Sun

61
Q

Storms on the Sun hurl charged particles out in great fountains, many of which pass

A

Near Earth and are trapped by its magnetic field

62
Q

Trapped particles follow corkscrew paths around the magnetic field lines of Earth and bounce between

A

Earth’s magnetic poles high above the atmosphere

63
Q

Disturbance in Earth’s field often allow the particles to dip into the atmosphere, causing it

A

To glow like a fluorescent lamp and this is the beautiful aurora

Physics 130: Lecture Slide (Chapter Review) (23 decks)

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