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A molecule of a substance has perma...

A molecule of a substance has permanent dipole moment p . A mole of this substance is polarised by applying a storg electrostatic field E . The direction of the field is suddenly changed of `60 ^(@)` . If N is the avogadro's number the amount of work done by the field is

A

`2NpE`

B

`(1 )/(2) NpE`

C

`NpE`

D

`(3 )/(2) NpE`

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Define mole of a substance.

A molecule of a substance has a permanent electric dipole moment of magnitude 10^(-29) C m. A mole of this substance is polarised (at low temperature) by applying a strong electrostatic field of magnitude 10^(6) V m^(-1) . The direction of the field is suddenly changed by an angle of 60^(@) . Estimate the heat released by the substance in aligning its dipoles along the new direction of the field. For simplicity, assume 100% polarisation of the sample.

Knowledge Check

  • A molecule of a substance has permanent dipole moment p. A mole of this substance is polarised by applying a strong electrostatic field E. The direction of the field is suddenly changed by an angle of 60^(@) . If N is the Avogadro's number the amount of work done by the field is

    A
    `2 NpE`
    B
    `1/2 NpE`
    C
    `NpE`
    D
    `3/2 NpE`

  • The molecule having permanent dipole moment is

    A
    `SF_4`
    B
    `CO_2`
    C
    `BF_3`
    D
    `SiF_4`

  • Which has the maximum dipole moment-

    A
    `CO_(2)`
    B
    `CH_(4)`
    C
    `NH_(3)`
    D
    `NF_(3)`

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