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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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