THE EARTH'S MAGNETISM OR TERRESTRIAL MAGNETISM

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THE EARTH'S MAGNETISM (OR) TERRESTRIAL MAGNETISM:In 1600 William Gilbert who was a physician to queen Elizabeth1 of England, showed that the force acting on a suspended magnet is not due to the influence of the pole star but to a magnetic field which is present all over the surface of the earth, as if the earth was magnetized. Gilbert made a large spherical ball from magnetite, the poles of which were situated on two opposite ends. By placing a small magnetic compass on this magnetite sphere, Gilbert showed that the compass took up a definite direction at different points on the sphere as it does in the case of the earth. According to his view the magnetic field on the surface of the earth can be approximately represented as if caused by a huge imaginary bar magnet in the interior of the earth but inclined to the geographic north and south axis of the earth. This concept of terrestrial magnetism has been illustrated as shown in figure. The north end of the imaginary magnet has a south polarity while the south end possesses the north polarity
Declination:In order to understand the term declination, let us first define two terms. Geographic meridian and magnetic meridian.Geographic meridian at any place is a vertical plane passing through the geographic north and south poles of the earth. Magnetic meridian at any place is a vertical plane passing through the magnetic north and south poles of the earth.The angle between the magnetic meridian and the geographic meridian at a place is known as declination or variation,In figure, ABCD is the magnetic meridian and ABCdashDdash represents the geographic meridian at a place. The angle BABdash=θ is the angle of declination. The angle of declination varies from place to place on the earth's surface. Gilbert believed that the declination at any one place was constant in time. But this belief was soon proved wrong. There were several periodic variations in the value of declination for a given location.

[@babudallay]

I was going through this chapter and my book was confusing me.I came to a conclusion that it was wrong and made correction my self in the book. After some time i doubted my visualization so started browsing and found i was right and the book had made made a blunder mistake while labeling a figure.
Thanks to you guys.

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[@Conqurer26]

Bhai kaun si book 📚📖 thi ?

[@joseph-n8y]

Relatively the best explanation I've seen. More explanation of the components is needed. How the components are expressed with the compass needle

[@eshakumari4439]

Thnks helped me a lot in visualization and clearing concepts .👍👍👍

[@saikiran-jq2ns]

In 2020 .
😎nice graphical explination

[@sinhafamilyblog]

omg this topic confused me a lot.thanks sir for your support my all doubts are cleared now . Thanks once again

[@sushantravva8533]

It was super easy to understand...
Short and sweet.. Thanks!!

[@nischaldahal3071]

Lie op ❤️

[@amandeepbatra5213]

can u explain the diff. b/w true angle and apparent angle

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"Elizabeth the one."xD

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@@UCSAdityaKumarChoudhury So if someone can't speak english, they are uneducated?

[@lakshyakhera]

Great video, thanks alot. 😊

[@mirzaaminurrahaman1534]

Very Helpful .....@Thanks

[@aayushman24]

How angle of declination varies??

[@7activestudio]

it varies seasonally due to the tilt of the earth on its axis of rotation...and the rotation of the earth around the sun, if the earth will not tilted on its axis of rotation then the declination would always be zero angle...

[@aayushman24]

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[@harshitawankhade4166]

Very helpful video

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Its a great video but still it has less likes and views why??

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Very good .

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Excellent Skills to explain.

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Thnx a lot very useful

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Most welcome 😊

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Thanks...

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nice video this is very helpful for me & its clear the concept

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So helpful for me😁

[@akhilakumarsamal1172]

Tq .... this is really very helpful but sir could you make your videos in Hindi....... That will easy for us that I think....

[@akhilakumarsamal1172]

By the way .....Happy teachers day sir 😃

[@adityaagrawal5385]

thanks a lot

[@romishakhatun7437]

Helpful

[@vincentmorata2589]

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[@sumitradevi456]

Nice video

[@RaHul-yr3ye]

Geographical meridian at a point is plane which includes (the point(anywhere in earth), north pole, south pole)
Magnetic meridian at a point is plane which includes (the same point, north magnetic pole, south magnetic pole)
And angle of declination is angle between these two planes ...
I think visualisation in this video is wrong.

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