JEE Main 2017 Physics question
An electric dipole has fixed dipole moment , which makes angle with respect to the -axis. When subjected to an electric field , it experiences a torque . When subjected to another electric field it experiences a torque . The angle is:
Answer: (4)
Solution
Write the dipole moment in the -plane as . The torque on a dipole is . With ,
= p(θ i + θ j)× E i = -pEθ k,
since . So $
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