A molecule of a substance has a permanent electric dipole moment of magnitude 
cm. A mole of this substance is polarized by applying a strong electrostatic field of magnitude 
V 
. The direction of field is changed by an angle 
. The heat released by the substance in aligning its dipole along the new direction of the field is.
Text Solution
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Dipole moment of each molecules 
As 1 mole of the substance contains 
molecules Total dipole moment of all the molecules
Initial potential energy, 
Final potential energy,
Work done = - [change in potential energy]
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