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Grade: 12

could u please explain the following definition of magnetic dip:

magnetic dip or magnetic inclination at a place is defined as the angle which the direction of total strength of earth's magnetic field makes with a horizontal line in magnetic meridian.

what does total strength of earth's magnetic field imply here??? And what is horizotal component??

what exactly are magnetic and geographic meridian??

10 years ago

Answers : (1)

Ramesh V
70 Points


A vertical plane passing through the axis of a freely suspended magnetic needle is called magnetic meridian and the vertical plane passing through the geographic north - south direction (axis of rotation of Earth) is called geographic meridian.


Magnetic meridian is a line on the earth's surface, passing in the direction of the horizontal component of the earth's magnetic field.


Dip is defined as the angle between the direction of Earth’s magnetic field and the direction of horizontal component of earths magentic field. It is the angle by which the total Earth’s magnetic field dips or comes out of the horizontal plane. It is denoted by δ. The value of dip varies from place to place. It is Oo along the equator and 90o at the poles. At Chennai the value of dip is about 9o7.

strength of the Earth’s magnetic field :

Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the north pole and the other near the geographic south pole. An imaginary line joining the magnetic poles would be inclined by approximately 11.3° from the planet's axis of rotation.

The strength of the Earth’s magnetic field varies tremendously around the world. The following figure shows the magnetic field intensity around the world in 2005 . The magnetic field has greatest strength near the poles and the weakest area over South America and across the El Nino area of the Pacific Ocean.

The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia



Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best.

Naga Ramesh
IIT Kgp - 2005 batch


10 years ago
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