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The earth's field departs from its dipol...

The earth's field departs from its dipole shpae substantially at large distance (greater than about 3000 km). The responsible factor for this distortion is

A

motion of ions in earth's ionosphere

B

motion of ions in earth's atmosphere

C

motion of ions in earth's lithosphere

D

motion of ions in the space.

Text Solution

Verified by Experts

The correct Answer is:
A
Due to motion of ions in earth's ionosphere the earth's magnetic field gets modified.
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NCERT FINGERTIPS ENGLISH-MAGNETISM AND MATTER -THE EARTH S MAGNETISM
  1. The earth behaves as a magnet with magnetic Held pointing approximate...

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  2. The strength of the earth's magnetic field is

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  3. Which of the following is responsible for the earth's magnetic field?

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  4. Which of the following is independent quantities is not used to specif...

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  5. If you made a map of magnetic field lines at Melbourne in Australia, ...

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  6. The horizontal and vertical components of earth's magnetic field at a ...

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  7. Let the magnetic field on earth be modeled by that of a point magneti...

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  8. Consider the plane S formed by the dipole axis and the axis of earth. ...

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  9. The dip angle at a location in southern India is about 18^(@). Then th...

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  10. What is the angle of dip at a place where horizontal and vertical comp...

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  11. The vertical component of earth's magnetic field at a place is sqrt3 ...

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  12. At a certain location in Africa, compass points 12^@ west of geographi...

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  13. Assume the dipole model of earth's magnetic field B which is given by ...

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  14. The angle of dip at the poles and the equator respectively are

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  15. At a given place on earth's surface the horizontal component of earths...

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  16. The earth's field departs from its dipole shpae substantially at large...

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  17. In the magnetic meridian of a certain place, the horizontal component ...

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  18. The earth's magnetic field at the equator is approximately 0*4G, Estim...

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  19. A compass needle whose magnetic moment is 60Am^2 pointing geograhic no...

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