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Q.

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

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a

– 2pE

b

– pE

c

pE

d

2pE

answer is D.

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Detailed Solution

W=PE(1−cos⁡θ) here θ=180∘∴W=PE1−cos⁡180∘=PE[1−(−1)]=2PE
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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