magnetism

Question 1

where objects are attracted or repelled to one another

Answer 1

magnetism

Question 2

● magnetic oxide of iron
● rod-like stone that when suspended by a
string, it rotates back and forth.
● most magnetic of all naturally occurring
minerals on earth.

Answer 2

magnetite

Question 3

● accumulation of many atomic magnets with their dipoles aligned
● If all of these magnetic domain aligned, it will create a magnet

Answer 3

magnetic domain

Question 4

● nuclear magnetic dipole
● rotates on its own axis and produces
magnetic field

Answer 4

magnetic moment

Question 5

● ability of a material to attract the lines of magnetic field density
● refers to a material’s ability to absorb magnetic flux (change)

Answer 5

magnetic permeability

Question 6

● degree to which a material can be magnetized
● ability of a material to become magnetized by an external magnetic field

Answer 6

magnetic susceptibility

Question 7

classification of magnets

Answer 7

natura magnet
artificial magnet
electromagnet

Question 8

• magnets that occur in nature.
• best example is EARTH

Answer 8

natural magnet

Question 9

• Strong magnetic fields that do not fade.
• Man-made

Answer 9

artificial magnet

Question 10

best example of artificial magnet

Answer 10

magnetic compass

Question 11

● temporary magnets produced by means of an electric current.
● magnets that run on electricity
● simply the coils of wire usually wrapped
around an iron core.
● strength of magnetic field is directly
proportional to the amount of current

Answer 11

electromagnet

Question 12

coil of wire

Answer 12

solenoid

Question 13

4 magnetic states of matter

Answer 13

non magnetic
ferromagnetic
paramagnetic
diamagnetic

Question 14

unaffected when brought into the magnetic field.

Answer 14

non magnetic

Question 15

ex of non magnetic

Answer 15

wood and glass

Question 16

● have a large, positive susceptibility to an external magnetic field
● exhibit strong attraction to magnetic field
● made by human

Answer 16

ferromagnetic

Question 17

ex of ferromagnetic

Answer 17

iron, alnico

Question 18

● lies somewhere within ferromagnets and diamagnets.
● Does not retain the magnetic properties when an external field is removed

Answer 18

paramagnetic

Question 19

ex of paramagnetic, used as main component of contrast agent in MRI

Answer 19

gadolinium

Question 20

weakly repelled from both poles of a magnetic field.

Answer 20

diamagnetic

Question 21

ex of diamagnetic

Answer 21

water and plastic

Question 22

magnetic laws

Answer 22

dipole
attraction and repulsion
induction
magnetic force

Question 23

states that dividing a magnet into smaller pieces will only create small magnets with north and south poles

Answer 23

dipole

Question 24

proportional to the product of the magnetic pole strengths divided by the square of the distance between them

Answer 24

magnetic force

Question 25

electrostatic charge can be induced from one material to another, so some materials can be made by induction

Answer 25

induction

Question 26

SI unit of magnesium field strength

Answer 26

tesla

Question 27

older SI unit of magnesium field strength

Answer 27

gauss

Question 28

The earth’s magnetic field strength is approximately __ at the equator in both poles __

Answer 28

50uT, 100uT

Question 29

● observed that the legs of the frog twitched during dissection when two metals touched.

Answer 29

Luigi Galvanni

Question 30

● invented Voltaic Pile ● First “wet cell battery” ● Sandwiched Zn and Cu

Answer 30

Alessandro Volta

Question 31

● discovered that the electric current creates a magnetic field. ● Any charged particle in motion induces a magnetic field

Answer 31

Hans Oersted

Question 32

● Credited the discovery of induction in 1831 ● Concluded that the magnetic field cant be used to generate electric current. ● Made the first dynamo in 1837

Answer 32

Michael Faraday

Question 33

states that the direction of the induced current opposes the action that induces it.

Answer 33

Heinrich Lenz, Lenz Law

Question 34

● Practical application of Faraday’s law. ● A device that converts mechanical energy to electrical energy ● Can be called energy converter

Answer 34

electric generator

Question 35

● Practical application of Oersted Discovery. ● Transform Electrical Energy to Mechanical Energy

Answer 35

electric motor