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 :

1. A. 2NpE
2. B. 1 2 NpE
3. C. NpE
4. D. 3 2 NpE

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