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A molecule of a substance has permanent ...

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

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Knowledge Check

  • A magnet of magnetic moment M is situated with its axis along the direction of a magnetic field of strngth B the work done by an external agent in rotating it by an angle of 180^@ will be

    A
    (-MB)
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    (+2MB)

  • The increase in electrostatic potential energy of a dipole of moment p when it is taken from parallel to anti-parallel orientation in an electric field E is

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