Chapter 24: Magnetism

Question 1

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

Answer 1

Separation as specified in Coulomb’s law

Question 2

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

Answer 2

Motion

Question 3

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

Answer 3

Magnetic force

Question 4

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

Answer 4

Which end of the magnet is held near the other

Question 5

Magnetic poles behavior similar to

Answer 5

Electrical forces

Question 6

Strength of interaction depends on the distance between the

Answer 6

Two magnets

Question 7

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

Answer 7

1) North pole
2) South pole

Question 8

North and South pole

Answer 8

North seeking pole and south seeking pole

Question 9

Rule for magnetic forces between magnetic poles like

Answer 9

Poles repels and opposite poles area attract

Question 10

In all magnets cannot have

Answer 10

One pole without the other

Question 11

No single pole known to

Answer 11

Exist

Question 12

Simple bar magnet

Answer 12

Poles at the two ends

Question 13

Horseshoe magnet

Answer 13

Bent U Shape poles at ends

Question 14

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

Answer 14

A north pole and south pole and these cannot be separated

Question 15

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

Answer 15

Stronger and weaker magnet

Question 16

Region of magnetic influence surrounding

Answer 16

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

Question 17

Strength indicated by closeness of the lines

Answer 17

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

Question 18

Magnetic field produced by two kinds of electron motion

Answer 18

1) Electron pin
2) Electron revolutions

Question 19

Electron spin main contributor to

Answer 19

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

Question 20

Electron revolution orbits or energy levels that electrons occupy

Answer 20

Around the nucleus of an atom

Question 21

Magnetized clusters of

Answer 21

Aligned magnetic atoms

Question 22

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

Answer 22

A strong magnetic field

Question 23

Stroking material with a magnet to

Answer 23

Align the domains

Question 24

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

Answer 24

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

Question 25

Temporary magnet alignment of domains return to

Answer 25

Random arrangement once external magnetic field is removed

Question 26

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

Answer 26

An equally strong magnet

Question 27

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

Answer 27

Current of charges also produces a magnetic field

Question 28

Magnetic field forms a pattern of

Answer 28

Concentric circles around a current-carrying wire

Question 29

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

Answer 29

Reverse

Question 30

Right hand rule tells us the direction of

Answer 30

The B-field

Question 31

Curl hands around the loop in the direction of

Answer 31

Current and thumb gives you direction of the B-field

Question 32

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

Answer 32

Bent into a loop

Question 33

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

Answer 33

Current-carrying coil temporary magnet

Question 34

Electromagnet

Answer 34

Iron bar placed in a current carrying coil

Question 35

An electromagnet can be made stronger by increasing the

Answer 35

Number of turns of wire and the current in the coil

Question 36

A current carrying coil of wire is

Answer 36

An electro magnet

Question 37

The strength of an electromagnet is increased by

Answer 37

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

Question 38

Industrial magnets gain additional strength by

Answer 38

Having a piece of iron within the coil

Question 39

Magnetic domains in the iron core are

Answer 39

Induced into alignment adding to the field

Question 40

Electromagnets without iron cores are used in

Answer 40

Magnetically levitated or maglev transportation

Question 41

Levitation is accomplished by

Answer 41

Magnetic coils that run along the track called a guideway

Question 42

The coil repel large magnets on

Answer 42

The train's undercarriage

Question 43

Continually alternating electric current fed to the coils continually alternates their

Answer 43

Magnetic polarity, pulling and pushing the train forward

Question 44

Moving charges in a magnetic field experience a

Answer 44

Deflecting force

Question 45

Greatest force

Answer 45

Particle movement in direction perpendicular to the magnetic field lines

Question 46

Least force

Answer 46

Particle movement other than perpendicular to the magnetic field lines

Question 47

No force

Answer 47

Particle movement parallel to the magnetic field lines

Question 48

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

Answer 48

A magnetic field

Question 49

Direction is perpendicular to

Answer 49

Both magnetic field lines and current perpendicular to wire

Question 50

Strongest when current is

Answer 50

Perpendicular to the magnetic field lines

Question 51

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

Answer 51

The magnetic force is always perpendicular to its motion

Question 52

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

Answer 52

Direction

Question 53

Earth itself is a huge

Answer 53

Magnet

Question 54

The magnetic pole of Earth are widely separated from

Answer 54

The geographic poles

Question 55

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

Answer 55

Electric currents

Question 56

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

Answer 56

The magnetic field

Question 57

Universe is a shooting gallery of charged particles called

Answer 57

Cosmic rays

Question 58

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

Answer 58

Hazardous to astronauts

Question 59

Cosmic rays are deflected away from Earth by

Answer 59

Earth's magnetic field

Question 60

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

Answer 60

The outer belt probably come from the Sun

Question 61

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

Answer 61

Near Earth and are trapped by its magnetic field

Question 62

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

Answer 62

Earth's magnetic poles high above the atmosphere

Question 63

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

Answer 63

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