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why earth can be considerd as a huge bar magnet.

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Bar magnets

Bar Magnets

Obtain the Earth’s magnetisation assuming that the Earth’s field can be approximated by a giant bar magnet of magnetic moment 8.0xx10^22Am^2 .The Earth 's radius is 6400 km.

A short bar magnet is placed along N-S direction with N pole pointing north. The neutral points are located 20 cm away from the bar magnet. If B_(H) is the horizontal component of earth's magnetic field then the magnetic field due to the bar magnet at distance of 40 cm along its axis is

PEARSON IIT JEE FOUNDATION-MAGNETISM -Concept Application (level-1)
  1. why earth can be considerd as a huge bar magnet.

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  2. The magnetic compass is not useful for navigation near the magnetic po...

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  3. why in an electrical method of magnetisation, a direct current is used...

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  4. The polarity of an electromagnet can be changed by changing the direct...

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  5. Repulsion is a sure test for magnetism.

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  6. Can we have a single north pole, or a single south pole?

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  7. Natural magnets are stronger than artificial magnets.

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  8. Magnetic lines of force are

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  9. In which of the following devices temporary magnets are used ?

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  10. Which of the following properties of a magnet is/are used in navigatio...

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  11. Choose the correct match. {:("(i) Primary succession","(a) Fast"),("...

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  12. The direction of magnetic field at any point inside the field is given...

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  13. Which of the following is a non- magnetic substance ?

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  14. When an iron bar is moved over a bar magnet along its length the attra...

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  15. The attracting power of a magnet is

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  16. The above diagrame is the pattern of magnetic lines of force obtained ...

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  17. In the single touch method of magnetization , the north pole of a bar ...

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  18. Assertion: Magnetic lines of force never intersect. Reason: The dire...

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  19. The vertical plane in which magnetic needle lies at a place is called

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  20. The effective length of the magnet shown above is .

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