C11 Terms

Question 1

Any object that possesses or can generate a magnetic field

Answer 1

magnet

Question 2

One of two areas of concentrated magnetic field lines on a magnets surface

Answer 2

magnetic pole

Question 3

Magnetic dipole

Answer 3

The north and south ends of a magnet

Question 4

Magnetic field

Answer 4

The force exerted by a magnet

Question 5

Paramagnetism

Answer 5

Materials that are only slightly attracted to magnets

Question 6

Domain magnetic

Answer 6

Where most of the magnetic dipoles are pointed in one direction

Question 7

Permanent magnet

Answer 7

A ferromagnetic material containing enough aligned magnetic domains to make it a permanent magnetic character

Question 8

The phenomenon observed in materials that are highly permeable to magnetic lines of force because their magnetic domains align with the field reinforcing it. Alighted magnetic domains can produce permanent magnetism

Answer 8

ferrimagnetism

Question 9

Weaken an external magnetic field by generating an opposite field

Answer 9

diamagnetism

Question 10

The temperature at which the magnetic field of a substance no longer act

Answer 10

Curie temperature

Question 11

Where the earths axis is

Answer 11

geographic North Pole

Question 12

Where the magnetic fields of the earth are pointed strait down

Answer 12

magnetic North Pole

Question 13

The magnetic field of the earth

Answer 13

geomagnetic field

Question 14

It is used to determine the direction of a magnetic field

Answer 14

right hand rule of magnetism

Question 15

A magnet that uses electricity

Answer 15

electromagnet

Question 16

Magnetism moving electrons

Answer 16

electromagnetic induction

Question 17

The rotating part of a generator

Answer 17

rotor

Question 18

The ring of coils surrounding the rotator

Answer 18

stator

Question 19

The current charges direction

Answer 19

alternating current (AC)

Question 20

The rate at which AC current changes direction

Answer 20

hertz (Hz)

Question 21

A machine that converts the energy of a moving fluid into rotational motion

Answer 21

turbine

Question 22

Assists in transferring electricity from a rotating shaft

Answer 22

commutator

Question 23

Transfers electricity from a rotating shaft

Answer 23

brush

Question 24

Converts electrical energy into mechanical energy

Answer 24

motor

Question 25

What device changes voltage?

Answer 25

transformer

Question 26

A magnet that has no resistance at low temperatures

Answer 26

superconducting magnet

Question 27

What feature of ferromagnetic materials makes them different from other materials

Answer 27

They are neutral

Question 27

What magnetic evidence do we have that the interior of the earth is not just solid rock acting as a bar magnet?

Answer 27

Magnetic north is moving

Question 28

Why would the lack of a strong geomagnetic field be a problem do the earth?

Answer 28

Solar radiation would kill all life on earth

Question 29

Does a straight piece of a current carrying wire have magnetic poles?

Answer 29

Yes

Question 30

Which type of magnetic material is used as the core of an electromagnetic

Answer 30

Iron

Question 31

What two factors determine the direction of the current induced in the coil of an AC generator

Answer 31

The north and south poles on a magnet

Question 32

What is the standard AC supply frequency in the US

Answer 32

60Hz

Question 33

What are two major structural differences between AC and DC generators

Answer 33

DC generators have commutators and brushes, and the magnets are stationary, whereas AC generators gave neither

Question 34

In which coil of a transformer does the current determine the strength of the magnetic field in the core

Answer 34

The input

Question 35

When are superconducting electromagnets required?

Answer 35

In particle accelerators

Question 36

(True or false). The strength of the magnetic field created by an electromagnet depends on the type of material in the core the number of wraps of wire and the amount of current in the wire

Answer 36

True