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Phys Lab > Lab 8 > Flashcards

Lab 8 Flashcards

1
Q

Magnetic field lines can cross each other.

True
False

A

False

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2
Q

How can you demagnetize a magnet?

Drop it a lot of times.
Store it away from other magnets.

A

Drop it a lot of times.

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3
Q

The geomagnetic south pole of earth _____ the north pole of a compass.

Attracts
Repels

A

Repels

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4
Q

1 Tesla equals ________.

1000 lines of flux through 1 m^2
10,000 lines of flux through 1 m^2
1000 lines of flux through 1 cm^2
10,000 lines of flux through 1 cm^2
1 line of flux through 1 m^2
A

10,000 lines of flux through 1 cm^2

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5
Q

If magnetic flux through an area of 0.16 m^2 is 0.9 Wb, what is the field strength (flux density), B?

0.2 T
05.6 T
0.14 T
0.1 T
6 T

A

6 T

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6
Q

Which of the following is not an example of magnetism in action?

the aurora borealis, or northern lights
a liquid crystal display (LCD) screen for a notebook computer
an electric drill 
the image on a television screen
an MRI of an injured athlete's knee
A

a liquid crystal display (LCD) screen for a notebook computer

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7
Q

Lines of force outside the magnet leave the magnet from the _____ and return to the ________.

south pole, north pole
north pole, south pole

A

north pole, south pole

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8
Q

The dip angle measured at earth’s equator to the poles varies from ___.

00 to 300
00 to 600
00 to 900
Dip angle does not vary

A

00 to 900

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9
Q

An area in a material where magnetic effects add up is called a ______.

monopole
field 
domain
pole
magnetic moment
A

domain

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10
Q

The geomagnetic north pole of earth ___ the north pole of a compass.

Attracts
Repels

A

Attracts

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11
Q

Earth’s geographic south pole is actually ____.

Magnetic north pole
Geomagnetic north pole
Geomagnetic south pole
Magnetic south pole
Both a and c
A

Both a and c

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12
Q

In the CGS system, one line of flux is called a ____.

Maxwell
Gauss
Tesla
field
pole
A

Maxwell

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13
Q

0.72 Tesla = ____ Gauss

720
72,000
7,200
72
.72
A

7,200

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14
Q

The geographic north pole of earth ___ the north pole of a compass.

Attracts
Repels

A

Attracts

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15
Q

What would happen to your magnetic field lines if you had another magnetic object too near your setup?

I would get crossing magnetic field lines.
I would get distorted magnetic field lines.
Nothing.
I would get two sets of field lines.
The compass would not work.

A

I would get distorted magnetic field lines.

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16
Q

Magnet flux is a product of which two things?

A. number of magnetic field lines and the area through which they pass
B. the area around the magnet and its number of poles
C.the magnetic field strength and the number of poles
D. magnetic field strength and the area through which magnetic field lines pass
E. number of magnetic field lines and number of magnets

A

D. magnetic field strength and the area through which magnetic field lines pass

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17
Q

1 Gauss equals _______.

1 magnetic field line
1 line of flux
1 magnetic field line through 1 cm^2
1 line of flux through 1 inch^2 
1 line of flux through 1 cm^2
A

1 line of flux through 1 cm^2

18
Q

In a magnetic field, there are neutral points where the magnetic field is zero. TRUE or FALSE?

True
False

A

True

19
Q

Dip angle at a place is defined as the angle which the direction of the total strength of the earth’s magnetic field makes with horizontal line.

True
False

A

True

20
Q

Why did you need to keep the magnets and any iron away from the compass when you were determining which way was North?

A. So that the compass needle would be affected ONLY by the earth’s magnetic field.
B. It wasn’t necessary to do that.

A

A. So that the compass needle would be affected ONLY by the earth’s magnetic field.

21
Q

The earth’s magnetic field is similar to magnetic field produced by _____.

A single bar magnets
Two attractive bar magnets
Two repulsive bar magnets
A U shaped magnet

A

A single bar magnets

22
Q

The earth’s magnetic ________ pole is located in the geographic north.

south
north

A

south

23
Q

If the flux density (B) is 5.2 T through and area of 0.50 m^2, what is the flux?

52 Wb
2.6 Wb
10.4 Wb
I don't even know what you're talking about.
3
A

2.6 Wb

24
Q

How is the magnetic field strength related to the distance away from the magnet?

It is directly proportional.
It is directly proportional to the square root of the distance.
It is inversely proportional to the square of the distance.
It is directly proportional to the square of the distance.
It is inversely proportional.

A

It is inversely proportional.

25
Q

Dip angle ____ depending on the position on the earth’s surface.

Can vary
Cannot vary

A

Can vary

26
Q

If flux = 3.9E-5 Wb and B = 5.2E-4 T, what is the area through which the flux is passing?

2.0E-6 cm^2
7.5 m^2
2.0E-8 m^2
75 cm^2
750 cm^2

A

750 cm^2

27
Q

How could you magnetize a non-magnetic iron objcet?

A. Iron materials are never magnetic.
B. Coat it with gold.
C. Place it in a strong magnetic field for a while.
D. There is no such thing as a non-magnetic iron object.
E. Use a compass to rearrange the domains.
F. @ Magnetic field associated with a compass is weaker than the earth’s magnetic field. If the earth’s field is not strong enough to align the domains in a non-magnetic iron object, the compass’s magnetic field cannot either.

A

C. Place it in a strong magnetic field for a while

28
Q

How were the magnetic field lines affected when you place LIKE poles near each other?

They stretched between the magnets and didn’t curve as much.
They curved out more, away from each other.
They were not affected.
They crossed each other as they curved back around to the magnet’s other pole.
They were squiggly.

A

They curved out more, away from each other.

29
Q

The magnitude of Earth’s magnetic field ____ over the surface of the earth.

Is constant
Varies
None of the above

A

Varies

30
Q

Suppose you want to illustrate graphically a magnet’s field. If you draw one field line for every 10.0 million (1.00E7) lines of flux, how many lines would you have to draw to illustrate a flux of 5.2 Wb?

I'm confused!
5.2 lines - 5 solid and 1 dotted 
5.2E15 lines -- too many!
52 lines
1.9E-2 lines
A

52 lines

31
Q

Since we know that a north magnetic pole will be attracted to a south magnetic pole and repelled by another north pole, then the north pole of a compass needle pointing to Earth’s geographic north pole indicates that this is

the Earth’s north magnetic pole
the Earth’s south magnetic pole

A

the Earth’s south magnetic pole

32
Q

Magnetic flux density has SI units of

Tesla 
Weber/m^2
Amperes/cm^2
Gauss
Both a and b
A

Both a and b

33
Q

5 Tesla equals how many Gauss?

10,000
5000
5
50,000
1000
A

50,000

34
Q

The magnetic field lines OUTSIDE a magnet go from north to south; how do they go INSIDE a magnet?

Also north to south
south to north

A

south to north

35
Q

The magnitude and direction of the earth’s magnetic field are measured using a ____.

Rotary motion sensor
Magnetic field sensor
Light sensor
Compass

A

Magnetic field sensor

36
Q

How were the magnetic field lines affected when you place unlike poles near each other?

They stretched between the magnets and didn’t curve out as much.
They curved out more, away from each other.
They were not affected.
They crossed each other as they curved back around to the magnet’s other pole.
They were squiggly.

A

They stretched between the magnets and didn’t curve out as much.

37
Q

What is a magnetic field?

The region in which magnetic forces due to the magnet are noticable
The force that repels electric charge

A

The region in which magnetic forces due to the magnet are noticable

38
Q

Earth’s geographic north pole is actually ____.

Magnetic north pole
Geomagnetic north pole
Geomagnetic south pole
Magnetic south pole 
Both b and d
A

Both b and d

39
Q

Do like poles attract or repel?

Repel
Attract

A

Repel

40
Q

Ferromagnetic materials are usually made up of at least one of the following except ____.

Aluminum
Chromium

A

Aluminum

Phys Lab (5 decks)

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