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How many neutral points on a horizontal ...

How many neutral points on a horizontal board are there when a magnet is held vertically on the board?

Text Solution

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There will be only one neutral point on the horizontal board. This is because field of earth is from south to north, and the field of magnetic pole on the board is radially outwards. At any point towards south of magnetic pole, field of earth and field of magnetic pole will cancel out to give a neutral point.
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Knowledge Check

  • How many neutral points will be obtained when a bar magnet is kept with magnetic moment parallel to earth's magnetic field ?

    A
    One
    B
    Two
    C
    Four
    D
    Infinite

  • 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).

  • 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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