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Q.

An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90° is 

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a

p2E

b

p E

c

Infinity

d

pE2

answer is B.

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Detailed Solution

Potential energy of dipole
U=−pEcos⁡θ2−cos⁡θ1 Here, θ1=00,θ2−90∘ ∴U=−pEcos⁡90∘−cos⁡0∘=pE(0−1)=pE

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