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Null points are obtained on the axial li...

Null points are obtained on the axial line , when the north pole of the bar magnet is pointing towards geographical south . Why ?

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Because earth.s field (magnetic ) lines are directed from to north . The null points cannot be on the equatorial line where the two fields are parallel.
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NEW JOYTHI PUBLICATION-MAGNETISM AND MATTER-EVALUATION QUESTIONS AND ANSWERS
  1. What are null points ?

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  2. What is the magnetic field along the axis and equatorial line of a bar...

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  3. Null points are obtained on the axial line , when the north pole of th...

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  4. Null points are obtained on equatorial line, when the north pole of th...

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  5. A magnetic substance is placed in magnetic fields of different intensi...

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  6. After magnetising a substance , by measuring which quantity we can und...

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  7. When we apply an external magnetising field to a material , what will ...

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  8. It there any relation between B and H ?

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  9. Is there any relation between M and H ?

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  10. Do all materials have a net magnetic moment in the normal state ?

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  11. What is the reason for magnetic moment of material ?

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  12. Do all materials behave in the same manner in a magnetic field ?

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  13. Pick the odd out of the following based on torque .

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  14. The interaction of electric charges q1 and q2 separated by a distance ...

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  15. A single pole doesn't exist . Why ?

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  16. The north pole of a freely suspended magnet points towards geographica...

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  17. When a bar magnet is dropped from the top of a building its magnetism ...

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  18. Is there difference between magnetic lines of force and electric lines...

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  19. Magnetic lines of force never intersect each other . What is the reaso...

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  20. A bar magnet of length 21 cm and pole strength m is placed in a unifor...

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