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?
