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The coercive force for certain permanen...

The coercive force for certain permanent magnet is `2times10^(4)A/m` .This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetize the magnet.The value of current (in A) is

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Knowledge Check

  • The magnetic field inside a long straight solenoid carrying current

    A
    is zero
    B
    decreases as we move towards its end
    C
    increases as we move towards its end
    D
    is the same at all points

  • The magnetic field inside a long straight solenoid-carrying current.

    A
    is zero
    B
    decreases as we move towards its end.
    C
    increases as we move towards its end.
    D
    is the same at all points.

  • An iron rod of volume 10^(-4) m^(3) and relative permeability 900 is placed inside a long solenoid wound with 6 turns/cm. If a current of 0.4 A is passed through the solenoid, the magnetic moment of the rod is

    A
    0.216 `Am^(2)`
    B
    2.16 `Am^(2)`
    C
    21.6 `Am^(2)`
    D
    `2.16 xx 10^(-2) Am^(2)`

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    The coercivity of a certain permanent magnet is 4*0xx10^4Am^-1 . This magnet is placed inside a solenoid 15cm long and having 600turns . Calculate the current required to demagnetise the magnet completely.

    The coercive force for a certain material is 10^4 A/m. A magnet made out of this material is placed inside a solenoid having 1000 turns/metre. What amount of electric current is required to demagnetise the material completely?

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