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Two equal magnetic poles placed 25 cm ap...

Two equal magnetic poles placed 25 cm apart in air exert a fore o `4xx10^-3N` on each other. What should be the distance between them, so that force exerted by them on each other becomes 0.1 N?

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MODERN PUBLICATION-MAGNETIC DIPOLE & EARTH'S MAGNETISM-EXERCISE
  1. What is a neutral point in a magnetic field of a bar magnet.

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  2. A bar magnet has a magnetic moment of 10 A m^2. If its magnetic length...

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  3. Two equal magnetic poles placed 25 cm apart in air exert a fore o 4xx1...

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  4. Two magnetic poles, one of which is four times stronger than the other...

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  5. Two like magnetic poles of strenth 25 A m and 64 A m are situated 1.0 ...

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  6. Two identical magnetic with a length 10 cm and weight 50 g of each are...

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  7. A magnetised steel wire 31.4cm long has a pole strength of 0.2Am. It i...

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  8. Two thin bar magnets of pole strengths 4Am and 7Am respectively and le...

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  9. A planar loop of irregular shape encloses an area of 7.5xx10^-4m^2, an...

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  10. A circular coil of 300 turns and diameter 14 cm carries a current of 1...

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  11. A circular coil of 200 turns and radius 0.2 m carries a current of 14 ...

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  12. An electron in an atom revolves around the nucleus in an orbit of radi...

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  13. In a hydrogen atom, the electron moves in an orbit of radius 0.5 overs...

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  14. In hydrogen atom, an electron is making 6.6xx 10^15 r.p.s around the n...

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  15. The electron in the hydrogen atom is moving with a speed of 2.3 xx 10^...

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  16. A muon is a particle that has the same charge as that of an electron b...

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  17. What is the magnitude of axial field due to a bar magnet of length 5 c...

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  18. A bar magnet is 0.1 m long and its pole strength is 12 Am. Find the ma...

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  19. Two short magnets of magnetic moment 2 Am^(2) and 5 Am^(2) are placed ...

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  20. A magnetised needle of magnetic moment 4.8 xx 10^-2JT^-1 is placed at ...

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