Explain dip of magnetic needle with neat sketch.

Explain dip of magnetic needle with neat sketch. 
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i) The inclination of the magnetic needle with the horizontal is called as magnetic dip of the needle. ii) Ordinary needle if perfectly balanced on pivot, remains in horizontal position. But when the needle is magnetized, it may not always remain in horizontal plane due to the magnetic influence of the earth. iii) In the northern hemisphere the north end of the needle is deflected downwards and in southern hemisphere the south end of the needle points downwards. iv) The dip is not constant but varies in different zones of the earth. It will be zero at the equator and 90o at the poles. v) To keep the needle in horizontal position a brass coil or aluminum strip as sliding weight is attached on the side of the needle which is at higher position.

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Description : Define true bearing and magnetic bearing.

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Description : What is mean by magnetic declination?

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Description : Define: (i) True meridian (ii) Magnetic meridian

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