In the figure an electric dipole swings from an initial orientation
i(\theta _(i)=21.8\deg )
to a final orientation
f(\theta _(f)=21.8\deg )
in a uniform external electric field
vec(E)
. The electric dipole moment is
2.12\times 10^(-27)C*m
; the field magnitude is
3.88\times 10^(6)(N)/(C)
. What is the change in the dipole's potential energy?