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Physical Science > C11 Terms > Flashcards

C11 Terms Flashcards

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1
Q

Any object that possesses or can generate a magnetic field

A

magnet

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2
Q

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

A

magnetic pole

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3
Q

Magnetic dipole

A

The north and south ends of a magnet

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4
Q

Magnetic field

A

The force exerted by a magnet

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5
Q

Paramagnetism

A

Materials that are only slightly attracted to magnets

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6
Q

Domain magnetic

A

Where most of the magnetic dipoles are pointed in one direction

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7
Q

Permanent magnet

A

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

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8
Q

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

A

ferrimagnetism

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9
Q

Weaken an external magnetic field by generating an opposite field

A

diamagnetism

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10
Q

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

A

Curie temperature

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11
Q

Where the earths axis is

A

geographic North Pole

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12
Q

Where the magnetic fields of the earth are pointed strait down

A

magnetic North Pole

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13
Q

The magnetic field of the earth

A

geomagnetic field

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14
Q

It is used to determine the direction of a magnetic field

A

right hand rule of magnetism

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15
Q

A magnet that uses electricity

A

electromagnet

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16
Q

Magnetism moving electrons

A

electromagnetic induction

17
Q

The rotating part of a generator

A

rotor

18
Q

The ring of coils surrounding the rotator

A

stator

19
Q

The current charges direction

A

alternating current (AC)

20
Q

The rate at which AC current changes direction

A

hertz (Hz)

21
Q

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

A

turbine

22
Q

Assists in transferring electricity from a rotating shaft

A

commutator

23
Q

Transfers electricity from a rotating shaft

A

brush

24
Q

Converts electrical energy into mechanical energy

A

motor

25
Q

What device changes voltage?

A

transformer

26
Q

A magnet that has no resistance at low temperatures

A

superconducting magnet

27
Q

What feature of ferromagnetic materials makes them different from other materials

A

They are neutral

27
Q

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

A

Magnetic north is moving

28
Q

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

A

Solar radiation would kill all life on earth

29
Q

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

A

Yes

30
Q

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

A

Iron

31
Q

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

A

The north and south poles on a magnet

32
Q

What is the standard AC supply frequency in the US

A

60Hz

33
Q

What are two major structural differences between AC and DC generators

A

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

34
Q

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

A

The input

35
Q

When are superconducting electromagnets required?

A

In particle accelerators

36
Q

(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

A

True

Physical Science (20 decks)

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