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Assertion: If a compass needle be kept a...

Assertion: If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in way direction.
Reason: Dip needle will stay vertical at the north pole of earth.

Text Solution

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A compass is free to move in a horizontal plane. On the other hand, the earth.s magnetic field is exactly vertical at the geomagnetic poles. So the compass can point in any direction at the poles as there will be no horizontal component of the magnetic field to affect the compass.
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MODERN PUBLICATION-MAGNETISM AND MATTER-NCERT FILE (NCERT TEXTBOOK EXERCISE)
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  2. If you made a map of magnetic field lines at Melbourne in Australia, w...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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