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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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