Earth's Magnetism
Introduction: We have a commom experience that when a bar magnet is suspended freely, it comes to rest in North and south direction. When a magnetic needle is placed in verticle plane, the needle deflects. This phenomenon is due to earth's magnetic field.In this topic we are going to discuss about it in detail.
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| Photo by Denise Jans on Unsplash Earth's Magnetism |
Element of Earth's Magnetism
A study of Earth's magnetic field is called as terrestrial magnetism. It is also called as Geomagnetism.
Geographical Axis: A straight line passing through both the pole of the earth is called a Geographical axis.
Magnetic Axis: An imaginary line passing through both the poles of the Earth's Magnet is called as Magnetic Axis (M M')
Angle of Inclination (Φ): Angle made with the direction of magnetic field and horizontal at a place is called as Angle of inclination
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| Earth's Magnetism |
Geographical Axis: A straight line passing through both the pole of the earth is called a Geographical axis.
Geographic Equator: A plane perpendicular to the geographic axis is called as the geographic equator.
Magnetic Axis: An imaginary line passing through both the poles of the Earth's Magnet is called as Magnetic Axis (M M')
Magnetic Equator: An imaginary line passing through the center of the Earth and perpendicular to the Magnetic Axis is called as Magnetic Axis (B B')
Geographic Meridian: A plane passing through the geographic axis and perpendicular to the surface is called a Geographic meridian.
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| Geographic Meridian |
Magnetic Meridian: A plane passing through the Magnetic axis and perpendicular to the surface is called a Magnetic meridian.
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| Magnetic Meridian |
Angle of declination (𝞪): Angle made with the geographic meridian and Magnetic meridian at a place is called as Angle of declination
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