Q. A point dipole with dipole moment, , is kept at the origin. An external electric field given by, , is applied on it. Which one of the following statements is true ?

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Solution:

The given electric field is uniform in nature. Thus, the net force acting on it will be zero. However, couple of forces will act on either charges of the dipole in opposite direction that would constitute torque. Due to this torque the dipole would rotate.
As, torque on the dipole is given as
Given,
and then



and
So, it implies that torque is acting on the dipole rotating it on -y plane. However, the interaktion energy between the dipole and electric field