Electrostatics Question 314

Question: A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to be done by an external agency is [UPSEAT 2004]

Options:

A) ? 2pE

B) ? pE

C) pE

D) 2pE

Show Answer

Answer:

Correct Answer: D

Solution:

$ W=PE(1-\cos \theta ) $ here $ \theta =\text{18}{{0}^{\text{o}}} $

$ \therefore $ W = $ PE(1-\cos 180^{o}) $ = $ PE[1-(-1)]=2PE $



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