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First Semester (BSMT) > Earth's magnetism (MIDTERM) > Flashcards

Earth's magnetism (MIDTERM) Flashcards

1
Q

Like many Planets in our Solar System the Earth has a

A

Magnetic Field

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2
Q

four layers of Earth

A

The Crust, The Mantle, The Outer Core, The Inner Core

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3
Q

A Thin Rock Material

A

The Crust:

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4
Q

:A Dense and Mostly SolidRock Material

A

The Mantle

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5
Q

Liquid Iron and Nickel

A

The Outer Core:

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6
Q

Solid Iron and Nickel

A

The Inner Core:

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7
Q

is an Electromagnet

A

The Iron Core of the Earth

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8
Q

The space surrounding the magnet up to which its influence felt is known as

A

magnetic field

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9
Q

States that The space surrounding the magnet up to which its influence felt is known as magnetic field

A

Michael Faraday

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10
Q

is the force of attraction or repulsion of a magnetic material due to the arrangement of its atoms, particularly its electrons

A

Magnetism

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11
Q

The ends of a magnet are where the magnetic effect is the strongest.

A

“poles.”

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12
Q

each magnet has 2poles –

A

1 north, 1 south

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13
Q

MAGNETIC DIPOLE 2 Types

A

Like pole repels!, Opposite poles attract!

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14
Q

is one of two ways that the intensity of a magnetic field can be expressed

A

Magnetic field strength

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15
Q

magnetic field strength H, measured in

A

amperes per meter (A/m),

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16
Q

amperes per meter (A/m),

A

magnetic field strength H

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17
Q

magnetic flux density B, measured in

A

Newton-meters per ampere (Nm/A), also called teslas (T)

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18
Q

Newton-meters per ampere (Nm/A), also called teslas (T)

A

magnetic flux density B

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19
Q

B stands for the

A

magnetic Flux density

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20
Q

which means the number of magnetic field lines of force crossing through a material

A

magnetic Flux density (B)

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21
Q

which is the force experienced by a unit North pole placed in a magnetic field.

A

magnetic field strength (H)

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22
Q

H for the

A

magnetic field strength

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23
Q

denotes the magnetic field strength which is a measure of the force in space, that is without any material medium

A

H value

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24
Q

. It is the complete force due to the magnetic field that is being generated

A

H value

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25
The process by which a substance, such as iron or steel, becomes magnetized by a magnetic field
Magnetic induction
26
is a substance that can possess magnetization in the absence of an external magnetic field
ferromagnetic material
27
There are two groups of magnetic materials as
soft magnetic materials and hard magnetic materials.
28
is a good example of a ferromagnetic material
Iron
29
cannot be demagnetized once it is magnetized
hard iron
30
can be demagnetized once it is magnetized
soft iron
31
permanent magnets
hard iron
32
used as electromagnets
soft iron
33
It is a measure of how a material respond when magnetic field is applied to it
MAGNETIZATION
34
It represents the extent to which a specimen is magnetized when placed in a magnetising field.
INTENSITY OF MAGNETIZATION (M)
35
the property of the material to allow the magnetic line of force to pass through it.
Magnetic Permeability
36
This the characteristic property of a medium
Permeability (μ)
37
It indicates the ease with which the material allows the magnetic lines of force to pass through it.
Permeability (μ)
38
It is the measure of the ability of a material to support the formation of a magnetic field within itself.
Permeability (μ)
39
it is the degree of magnetization that a material obtains in response to an applied magnetic field
Permeability (μ)
40
quantitative measure of the extent to which a material maybe magnetized in relation to a given applied magnetic field
magnetic susceptibility
41
sometimes denoted by the symbol μr, is the ratio of the permeability of a specific medium to the permeability of free space
Relative permeability,
42
region at each end of a magnet where the external magnetic field is strongest. A bar magnet suspended in Earth’s magnetic field orients itself in a north–south direction
Magnetic pole
43
The north-seeking pole of such a magnet, or any similar pole, is called a
north magnetic pole
44
The south-seeking pole, or any pole similar to it, is called a
south magnetic pole
45
It is the end that points north.This is often coloured red on a magnet or compass
north-seeking pole (abbreviated to just north pole or N)
46
this is the imaginary magnet inside the Earth
blue
47
an imaginary line roughly parallel to the geographical equator and passing through those points where a magnetic needle has no dip
magnetic equator:
48
is the angle made by a compass needle when the compass is held in a vertical orientation
Magnetic dip, dip angle, or magnetic inclination
49
indicate that the field is pointing downward, into the Earth, at the point of measurement
Positive values of inclination
50
- is the angle in the vertical plane between the horizontal and the Earths magnetic field at a point
ANGLE OF DIP
51
The Magnetic NorthPole is the position on the surface of theEarth where the dip(or inclination) is
plus 90 degrees
52
The MagneticSouth Pole is the position on the surface of the Earth where the dip (or inclination) is
minus90 degrees
53
Is a wavy curve joining all places where the dip is zero
Magnetic Equator:
54
Join places where the variation has the same value and sign
Isogonic Lines:
55
Join places where the variation is zero
Agonic Lines:
56
Join all places where dip has the same value and sign.
Isoclinic Line:
57
Is the line of no dip or magnetic equator
Aclinic Line:
58
.Sometimes called Magnetic Latitude.
Isoclinic Line:
59
Join places of equal force, horizontal or vertical
Isodynamic Lines:
60
, is the angle between magnetic north and true north
Magnetic declination, sometimes called magnetic variation
61
is positive east of true north and negative when west.
Declination
62
changes over time and with location. As the compass points with local magnetic fields, declination value is needed to obtain true north
Magnetic declination
63
is the angle between TN and MN and is measured in degrees East or West from the TN (0º-180º)
Variation
64
are pecked lines on a map or chart joining places of equal magnetic variation
Isogonals
65
is the name given to isogonals joining places of zero variation
Agonic Line
66
The magnetic declination in a given area will change slowly over time, possibly as much as _ depending upon how far from the magnetic poles it is.
2-25 degrees every hundred years or so,
67
Complex fluid motion in the outer core of the Earth (the molten metallic region that lies from2800 to 5000 km below the Earth's surface) causes the magnetic field to change slowly with time. This change is known as
secular variation
68
is the angle between magnetic north(the direction the north end of a compass needle points) and true north.
Magnetic declination
69
is the angle made by a compass needle when the compass is held in a vertical orientation
Magnetic inclination
70
the total intensity of the magnetic field vector
F
71
the horizontal intensity of the magnetic field vector
H
72
the vertical component of the magnetic field vector
Z
73
Are due to ferro-magnetic substances in the sea bottom or in mountains near the coast
Local Anomalies:
74
The overall effect of the permanent magnetism onboard is known as the
directive force.
75
is a Magnetized piece of metal that can spin
compass
76
The north tip of the compass always points towards the
North Pole of the Earth
77
used to lift scrap metal
large electromagnet
78
it is the - of the magnet that is underneath the North Pole of the Earth
blue south pole
79
makes the electrons flow at very high speed
Earth’s rotation
80
is the ratio of the permeability of a specific medium to the permeability of free space
RELATIVE PERMEABILITY
81

First Semester (BSMT) (22 decks)

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