Midterms | Unit 2.2 Magnetism

Question 1

A fundamental property of forms of matter

Answer 1

Magnetite

Question 2

Smallest unit of magnetism

Answer 2

It has no smallest unit

Question 3

Samples of Magnetite

Answer 3

o Oxide of iron (Fe3O4)
o Lodestone or leading stone

Question 4

Any charged particle in (1) creates a (2)

Answer 4

1. motion
2. magnetic field

Question 5

A property created when electrons behave as if they rotate on its axis

Answer 5

Electron Spin

Question 6

Electron Spin is neutralized in

Answer 6

Electron pairs

Question 7

It creates a magnetic field

Answer 7

Electron Spin

Question 8

The lines of a magnetic field are always —

Answer 8

closed loop

Question 9

A nuclear magnetic dipole created when a magnetic field is created by spinning electric charge

Answer 9

Magnetic Moment

Question 10

Basis for MRI

Answer 10

Magnetic Moment

Question 11

Any material that produces a magnetic field

Answer 11

Magnets

Question 12

Has north and south pole

Answer 12

Magnets

Question 13

Magnets that have two poles

Answer 13

Bipolar/ Dipolar

Question 14

The small magnet created by the electron orbit

Answer 14

Magnetic Dipole

Question 15

An accumulation of many atomic magnets with their dipoles aligned

Answer 15

Magnetic Domain

Question 16

The ability of a material to attract the lines of magnetic field intensity

Answer 16

MAGNETIC PERMEABILITY

Question 17

Example of material with high and low magnetic permeability

Answer 17

High magnetic permeability: Iron
Low magnetic permeability: Wood

Question 18

The degree to which a material can be magnetized

Answer 18

MAGNETIC SUSCEPTIBILITY

Question 19

Example of material with high and low magnetic susceptibility

Answer 19

High magnetic susceptibility: Iron
Low magnetic susceptibility: Wood

Question 20

Types of magnets

Answer 20

• Natural magnet
• Artificial-Permanent Magnet
• Electromagnets

Question 21

A magnet that gets its Magnetism from the Earth

Answer 21

Natural magnet

Question 22

Example of a natural magnet

Answer 22

Lodestone

Question 23

A magnet whose Magnetism is induced artificially-produced

Answer 23

Artificial-Permanent Magnet

Question 24

Example of an artificial-permanent magnet

Answer 24

Compass

Question 25

A bar or horseshoe-shaped magnet

Answer 25

Artificial-Permanent Magnet

Question 26

A coil of wire wrapped around an iron core that intensifies the magnetic field

Answer 26

Electromagnet

Question 27

All matters can be classified into how it interacts with the ---

Answer 27

external magnetic field

Question 28

4 magnetic states of matter

Answer 28

- Nonmagnetic - Diamagnetic - Paramagnetic - Ferromagnetic

Question 29

Unaffected by the magnetic field

Answer 29

Nonmagnetic

Question 30

Example of nonmagnetic

Answer 30

Wood and glass

Question 31

Weakly repelled from both poles of a magnetic field

Answer 31

Diamagnetic

Question 32

Example of diamagnetic

Answer 32

Copper, water & plastic

Question 33

Weakly attracted to both poles of a magnetic field

Answer 33

Paramagnetic

Question 34

Example of paramagnetic

Answer 34

Gadolinium (Gd-64): contrast agent in M.R.I.

Question 35

It can be strongly magnetized

Answer 35

Ferromagnetic

Question 36

Examples of ferromagnetics

Answer 36

AlNiCoFe (Al-12, Ni-28, Co-27) & Iron (Fe-26)

Question 37

An excellent temporary magnet

Answer 37

Soft iron

Question 38

MAGNETIC LAWS

Answer 38

▪ Like magnetic poles repel ▪ Unlike magnetic poles attract ▪ Imaginary lines of magnetic field enter the south pole ▪ Imaginary lines of magnetic field leave the north pole

Question 39

The force of attraction between unlike poles or repulsion between like poles

Answer 39

Magnetic Force

Question 40

Where is magnetic force directly and inversely proportional to?

Answer 40

Directly proportional to the product of the magnetic pole strengths Inversely proportional to the square of the distance between them

Question 41

SI unit for magnetic field

Answer 41

o SI Unit: tesla (T) o Older unit: gauss (G)

Question 42

How many gauss (G) in 1 tesla (T)?

Answer 42

1 T: 10,000 G