Dipole in a Uniform External Field

2025 1 question

1. An electric dipole with dipole moment $5 \times 10^{-6}\text{ C m}$ is aligned with the direction of a uniform electric field of magnitude $4 \times 10^5\text{ N/C}$. The dipole is then rotated through an angle of $60^\circ$ with respect to the electric field. The change in the potential energy of the dipole is: