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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
Q

The process by which a substance, such as iron or steel, becomes magnetized by a magnetic field

A

Magnetic induction

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26
Q

is a substance that can possess magnetization in the absence of an external magnetic field

A

ferromagnetic material

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27
Q

There are two groups of magnetic materials as

A

soft magnetic materials and hard magnetic materials.

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28
Q

is a good example of a ferromagnetic material

A

Iron

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29
Q

cannot be demagnetized once it is magnetized

A

hard iron

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30
Q

can be demagnetized once it is magnetized

A

soft iron

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31
Q

permanent magnets

A

hard iron

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32
Q

used as electromagnets

A

soft iron

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33
Q

It is a measure of how a material respond when magnetic field is applied to it

A

MAGNETIZATION

34
Q

It represents the extent to which a specimen is magnetized when placed in a magnetising field.

A

INTENSITY OF MAGNETIZATION (M)

35
Q

the property of the material to allow the magnetic line of force to pass through it.

A

Magnetic Permeability

36
Q

This the characteristic property of a medium

A

Permeability (μ)

37
Q

It indicates the ease with which the material allows the magnetic lines of force to pass through it.

A

Permeability (μ)

38
Q

It is the measure of the ability of a material to support the formation of a magnetic field within itself.

A

Permeability (μ)

39
Q

it is the degree of magnetization that a material obtains in response to an applied magnetic field

A

Permeability (μ)

40
Q

quantitative measure of the extent to which a material maybe magnetized in relation to a given applied magnetic field

A

magnetic susceptibility

41
Q

sometimes denoted by the symbol μr, is the ratio of the permeability of a specific medium to the permeability of free space

A

Relative permeability,

42
Q

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

A

Magnetic pole

43
Q

The north-seeking pole of such a magnet, or any similar pole, is called a

A

north magnetic pole

44
Q

The south-seeking pole, or any pole similar to it, is called a

A

south magnetic pole

45
Q

It is the end that points north.This is often coloured red on a magnet or compass

A

north-seeking pole (abbreviated to just north pole or N)

46
Q

this is the imaginary magnet inside the Earth

47
Q

an imaginary line roughly parallel to the geographical equator and passing through those points where a magnetic needle has no dip

A

magnetic equator:

48
Q

is the angle made by a compass needle when the compass is held in a vertical orientation

A

Magnetic dip, dip angle, or magnetic inclination

49
Q

indicate that the field is pointing downward, into the Earth, at the point of measurement

A

Positive values of inclination

50
Q
  • is the angle in the vertical plane between the horizontal and the Earths magnetic field at a point
A

ANGLE OF DIP

51
Q

The Magnetic NorthPole is the position on the surface of theEarth where the dip(or inclination) is

A

plus 90 degrees

52
Q

The MagneticSouth Pole is the position on the surface of the Earth where the dip (or inclination) is

A

minus90 degrees

53
Q

Is a wavy curve joining all places where the dip is zero

A

Magnetic Equator:

54
Q

Join places where the variation has the same value and sign

A

Isogonic Lines:

55
Q

Join places where the variation is zero

A

Agonic Lines:

56
Q

Join all places where dip has the same value and sign.

A

Isoclinic Line:

57
Q

Is the line of no dip or magnetic equator

A

Aclinic Line:

58
Q

.Sometimes called Magnetic Latitude.

A

Isoclinic Line:

59
Q

Join places of equal force, horizontal or vertical

A

Isodynamic Lines:

60
Q

, is the angle between magnetic north and true north

A

Magnetic declination, sometimes called magnetic variation

61
Q

is positive east of true north and negative when west.

A

Declination

62
Q

changes over time and with location. As the compass points with local magnetic fields, declination value is needed to obtain true north

A

Magnetic declination

63
Q

is the angle between TN and MN and is measured in degrees East or West from the TN (0º-180º)

64
Q

are pecked lines on a map or chart joining places of equal magnetic variation

65
Q

is the name given to isogonals joining places of zero variation

A

Agonic Line

66
Q

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.

A

2-25 degrees every hundred years or so,

67
Q

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

A

secular variation

68
Q

is the angle between magnetic north(the direction the north end of a compass needle points) and true north.

A

Magnetic declination

69
Q

is the angle made by a compass needle when the compass is held in a vertical orientation

A

Magnetic inclination

70
Q

the total intensity of the magnetic field vector

71
Q

the horizontal intensity of the magnetic field vector

72
Q

the vertical component of the magnetic field vector

73
Q

Are due to ferro-magnetic substances in the sea bottom or in mountains near the coast

A

Local Anomalies:

74
Q

The overall effect of the permanent magnetism onboard is known as the

A

directive force.

75
Q

is a Magnetized piece of metal that can spin

76
Q

The north tip of the compass always points towards the

A

North Pole of the Earth

77
Q

used to lift scrap metal

A

large electromagnet

78
Q

it is the - of the magnet that is underneath the North Pole of the Earth

A

blue south pole

79
Q

makes the electrons flow at very high speed

A

Earth’s rotation

80
Q

is the ratio of the permeability of a specific medium to the permeability of free space

A

RELATIVE PERMEABILITY

First Semester (BSMT) (22 decks)

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