In the figure an electric dipole swings from an initial orientation $i({}_i=17\mathrm{.}2)$ to a final orientation $f({}_f=17\mathrm{.}2)$ in a uniform external

electric field vec$(E).$ The electric dipole moment is $2\mathrm{.}90{10}^{-27}C*m$; the field magnitude is $1\mathrm{.}74{10}^6\frac{N}{C}.$ What is the change in the

dipole's potential energy?