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The earth's field, it is claimed, roughl...

The earth's field, it is claimed, roughly approximates the field due to a dipole of magnetic moment `8xx10^(22)JT^-1` located at its centre. Check the order of magnitude of this number in some way.

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Using the formula for magnetic field B on the normal bisector of a dipole of magnetic moment M.
`B = (mu_0)/(4pi) (M)/(r^3)`
here , ` M = 8 xx 10^22 JT^(-1) , r = 6.4 xx 10^6 m`
`rArr B = 0.3 G`
It is comparable with the order of magnitude of the observed field on the earth.
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MODERN PUBLICATION-MAGNETISM AND MATTER-NCERT FILE (NCERT TEXTBOOK EXERCISE)
  1. If you made a map of magnetic field lines at Melbourne in Australia, w...

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  2. Assertion: If a compass needle be kept at magnetic north pole of the e...

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  3. The earth's field, it is claimed, roughly approximates the field due t...

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  4. Answer the following questions regarding earth's magnetism. (a) A ve...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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