NEET 2012 Physics question
An electric dipole of moment '' is placed in an electric field of intensity ''. The dipole acquires a position such that the axis of the dipole makes an angle with the direction of the field. Assuming that the potential energy of the dipole to be zero when , the torque and the potential energy of the dipole will respectively be
Answer: (2)
Solution
The torque on a dipole is , so . The potential energy is the work done by an external agent in rotating the dipole from the reference angle to : $U =
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