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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

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At such a large distances Earth.s magnetic field gets modified due to the magnetic field of ions in motion that are present in the Earth.s ionosphere. These are sensitive disturbances not originated on the Earth such as the solar wind, solar radiation etc.
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Answer the following questions: (a) The earth's magnetic field varies from point to point in space. Does is also change with time? If so, on what time scale does it change appreciably? (b) The earth's core is known to contain iron. Yet geologists do not regard this as a source of earth's magnetism, why? (c) The charged currents in the outer conducting regions of earth's core are thought to be possible for earth's magnetism. What might be the battery to sustain these currents? (d) The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologist know about the earth's field in such distant past? (e) The earth's field departs from its dipole shape substantially at large distances (greater than about 30000km). What agencies may be responsible for this distortion? (f) Interstellar space has an extremely weak magnetic field of the order of 10^(-12)T . Can such a weak field be of any significant consequence? Explain.

A: The earth's field departs from its dipole shape substantially at large distances (greater than about 30,000 km). R: At large distances, the field gets modified due to the field of ions in motion in the ionosphere which is sensitive to extra-terrestrial distubances such as, the solar wind.

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The electric field of an electric dipole at a point on its axis , at a distance d from the center of the dipole, varies as

A point charge placed at any point on the axis of an electric dipole at some large distance experiences a force F. What will be the force acting on the point charge when its distance from the dipole is doubled.

MODERN PUBLICATION-MAGNETISM AND MATTER-NCERT FILE (NCERT TEXTBOOK EXERCISE)
  1. Answer the following questions: (a) The earth's magnetic field varies ...

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  2. The earth's core is known to contain iron. Yet geologists do not rega...

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  3. The charged currents in the outer conducting regions of the earth's co...

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  4. The earth may have been reversed the direction of its field several ti...

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

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  6. Answer the following questions: (a) The earth's magnetic field varies ...

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  7. A short bar magnet placed with its axis at 30^@ with a uniform extern...

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  8. A short bar magnet of moment 0*32JT^-1 is placed in a uniform external...

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  9. A closely wound solenoid of 800 turns and area of cross section 2*5xx1...

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  10. If the solenoid in the above question is free to turn about the vertic...

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  11. A bar magnet of magnetic moment 1.5JT^-1 lies aligned with the directi...

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  12. A closely wound solenoid of 2000 turns and area of cross section 1.6xx...

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  13. A circular coil of 16 turns and radius 10cm carrying a current of 0.75...

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  14. A magnetic needle free to rotate in a vertical plane parallel to the m...

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  15. At a certain location in Africa, a compass points 12^(@) west of the g...

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  16. A short bar magnet has a magnetic moment of 0*48JT^-1. Give the direct...

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  17. A short bar magnet placed in a horizontal plane has its axis aligned a...

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  18. If the bar magnet in the above problem is turned around by 180^@, wher...

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  19. A short bar magnet of mangetic moment 5*25xx10^-2JT^-1 is placed with ...

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  20. Why does a paramagnetic sample display greater magnetisation (for the ...

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