The water molecule is a permanent electric dipole with a dipole moment of $6.2\times {10}^{-30}\mathrm{C}\mathrm{m}$. A water molecule is aligned with an electric field of magnitude $7600\mathrm{V}/\mathrm{m}$. How much energy is required to rotate the molecule 180°?

Understand that the energy required to rotate a dipole in an electric field is given by the formula: U = -p * E * cos(θ), where U is the potential energy, p is the dipole moment, E is the electric field, and θ is the angle between the dipole moment and the electric field.