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How can a magnet be demagnetized ?...

How can a magnet be demagnetized ?

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Alilgnment of the molecular magnet changes when an alternate current is passed through it.
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Explain how a magnet gets demagnetized when an alternative current is passed through a coil in which the magnet is placed.

How are the molecular magnets of a magnet affected, when the magnet is demagnetized ?

Knowledge Check

  • A magnet can be magnetized :

    A
    By keeping it with the in contact gold
    B
    By keeping it with the contact in iron
    C
    by heating it
    D
    By rubbing it with another magnet

  • The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 xx 10^(3) A m^(-1) The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is

    A
    `9 mA`
    B
    30 mA
    C
    60 mA
    D
    3A

  • The coercitivity of a small magnet where the ferromagnet gets demagnetized is 3 xx 10^(3) Am^(-1) . The current required to be passed in a solenoid of length 10 cm and number of turns 100 , so that the magnet gets demagnetized when inside the solenoid , is :

    A
    ` 30 mA`
    B
    ` 60 mA`
    C
    `3 A`
    D
    ` 6 A`

    • Similar Questions

    Explore conceptually related problems

    A magnet can be demagnetised by

    A bar magnet makes 40 oscillations per minute in an oscillation magnetometer. An identical magnet is demagnetized completely and is placed over the magnet in the magnetometer. Find the time taken for 40 oscillations by this combination. Neglect any induced magnetism.

    Four situations I. A boy throws a ball up in the air and it falls freely on the ground. II. A horse pulls a cart and the cart moves forward. III. A can is opened with the help of an opener. IV. A magnet is demagnetized by hammering it. In which of the given situations is indirect application of force involved?

    Four situations I. A boy throws a ball up in the air and it falls freely on the ground. II. A horse pulls a cart and the cart moves forward. III. A can is opened with the help of an opener. IV. A magnet is demagnetized by hammering it. In which of the given situations is indirect application of force involved?

    The magnet can be completely demagnetized by

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