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Earth's Magnetic Field Study

The document discusses measuring Earth's magnetic field using a tangent galvanometer. It first introduces that Earth has a magnetic field generated by molten iron alloys in its outer core, and that this field protects the planet from solar radiation. It then provides details on the field's intensity measured in nanoteslas, and how near the surface it can be approximated as a tilted magnetic dipole with its south pole pointing towards geographic north. The objective is to study the horizontal component of Earth's magnetic field.

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24 views5 pages

Earth's Magnetic Field Study

The document discusses measuring Earth's magnetic field using a tangent galvanometer. It first introduces that Earth has a magnetic field generated by molten iron alloys in its outer core, and that this field protects the planet from solar radiation. It then provides details on the field's intensity measured in nanoteslas, and how near the surface it can be approximated as a tilted magnetic dipole with its south pole pointing towards geographic north. The objective is to study the horizontal component of Earth's magnetic field.

Uploaded by

ayushtripathi8081
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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OBJECTIVE

• TO STUDY THE EARTH’S


MAGNETIC FIELD USING
TANGENT GALVANOMETER.

• TO FIND OUT THE


HORIZONTAL COMPONENT OF
EARTH’S MAGNETIC FIELD (Bh)
INTRODUCTION
Earth's magnetic field, also known as the geomagnetic field, is
the magnetic field that extends from the Earth's interior to where
it meets the solar wind, a stream of charged particles emanating
from the Sun. Its magnitude at the Earth's surface ranges from
25 to 65 microteslas (0.25 to 0.65 gauss).Roughly speaking it is
the field of a magnetic dipole currently tilted at an angle of about
10 degrees with respect to Earth's rotational axis, as if there
were a bar magnet placed at that angle at the center of the
Earth. Unlike a bar magnet, however, Earth's magnetic field
changes over time because it is generated by a geodynamic (in
Earth's case, the motion of molten iron alloys in its outer core).
The North and South magnetic poles wander widely, but
sufficiently slowly for ordinary compasses to remain useful for
navigation. However, at irregular intervals averaging several
hundred thousand years, the Earth's field reverses and the North
and South Magnetic Poles relatively abruptly switch places.
These reversals of the geomagnetic poles leave a record in
rocks that are of value to paleomagnetists in calculating
geomagnetic fields in the past. Such information in turn is helpful
in studying the motions of continents and ocean floors in the
process of plate tectonics.
The magnetosphere is the region above the ionosphere and
extends several tens of thousands of kilometers into space,
protecting the Earth from the charged particles of the solar wind
and cosmic rays that would otherwise strip away the upper
atmosphere, including
the ozone layer that protects the Earth from harmful
ultravioletradiation.Earth's magnetic field serves to deflect most
of the solar wind, whose charged particles would otherwise strip
away the ozone layer that protects the Earth from harmful
ultraviolet radiation. One stripping mechanism is for gas to be
caught in bubbles of magnetic field, which are ripped off by solar
winds.

The intensity of the field is often measured in gauss (G), but is


generally reported innanoteslas (nT), with 1 G = 100,000 nT. A
nanotesla is also referred to as a gamma (γ).The tesla is the
SIunit of the Magnetic field, B. The field ranges between
approximately 25,000 and 65,000 nT (0.25–0.65 G).
Near the surface of the Earth, its magnetic field can be closely
approximated by the field of a magnetic dipole positioned at the
center of the Earth and tilted at an angle of about 10 degree with
respect to the rotational axis of the earth . The dipole is roughly
equivalent to a powerful bar magnet, with its South Pole pointing
towards the geomagnetic North Pole. The north pole of a magnet
is so defined because, if allowed to rotate freely, it points roughly
northward (in the geographic sense). Since the north pole of a
magnet attracts the south poles of other magnets and repels the
north poles, it must be attracted to the south pole

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