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Explain what is meant by neutral points? How will you calculate magnetic moment of a bar magnet by locating the neutral points?

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At a neutral point

A short bar magnet is placed in an external uniform magnetic field of 0.6 G such that its north pole is pointing towards geographical north. Calculate the magnetic moment of the magnet, if its neutral point is 6 cm away from the centre.

Knowledge Check

  • At a neutral point

    A
    field of magnet is zero
    B
    field of earth is zero
    C
    field of magnet is perpendicular to field to earth
    D
    None of the above

  • A bar magnet is placed with its North pole pointing North. Neutral point is at 12 cm . Another magnet is now placed on the first magnet, then the neutral point is found to be at 8 cm . The ratio of their magnetic moments is

    A
    `3:2`
    B
    `27:19`
    C
    `9:4`
    D
    `9:5`

  • At neutral point,the horizontal component of the magnetic field due to a magnet is

    A
    equal to earth's horizontal magnetic field
    B
    in the same direction of the earth's horizontal magnetic field
    C
    in the opposite direction of the earth's horizontal magnetic field
    D
    Both 'a' and 'c'

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    How does a magnetic compass behave at a neutral point?

    At what positions, the neutral points will lie for a bar magnet when magnetic axis of magnet is lying in the magnetic meridian (i) with N-pole of magnet pointing North (ii) with S-pole of magnet pointing North?

    What is the direction of the magnetic dipole moment in a bar magnet?

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    At neutral point, the horizontal component of the magnetic field due to a magnet is

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