Lab 8 Flashcards
(40 cards)
Magnetic field lines can cross each other.
True
False
False
How can you demagnetize a magnet?
Drop it a lot of times.
Store it away from other magnets.
Drop it a lot of times.
The geomagnetic south pole of earth _____ the north pole of a compass.
Attracts
Repels
Repels
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
10,000 lines of flux through 1 cm^2
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
6 T
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 liquid crystal display (LCD) screen for a notebook computer
Lines of force outside the magnet leave the magnet from the _____ and return to the ________.
south pole, north pole
north pole, south pole
north pole, south pole
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
00 to 900
An area in a material where magnetic effects add up is called a ______.
monopole field domain pole magnetic moment
domain
The geomagnetic north pole of earth ___ the north pole of a compass.
Attracts
Repels
Attracts
Earth’s geographic south pole is actually ____.
Magnetic north pole Geomagnetic north pole Geomagnetic south pole Magnetic south pole Both a and c
Both a and c
In the CGS system, one line of flux is called a ____.
Maxwell Gauss Tesla field pole
Maxwell
0.72 Tesla = ____ Gauss
720 72,000 7,200 72 .72
7,200
The geographic north pole of earth ___ the north pole of a compass.
Attracts
Repels
Attracts
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.
I would get distorted magnetic field lines.
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
D. magnetic field strength and the area through which magnetic field lines pass
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
1 line of flux through 1 cm^2
In a magnetic field, there are neutral points where the magnetic field is zero. TRUE or FALSE?
True
False
True
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
True
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. So that the compass needle would be affected ONLY by the earth’s magnetic field.
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 single bar magnets
The earth’s magnetic ________ pole is located in the geographic north.
south
north
south
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
2.6 Wb
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.
It is inversely proportional.
