The dipole moment of a molecule is \( 10^{-30} \, \text{Cm} \). It is placed in an electric field \( \vec{E} \) of \( 10^5 \, \text{V/m} \) such that its axis is along the electric field. The direction of \( \vec{E} \) is suddenly changed by \( 60^\circ \) at an instant. Find the change in the potential energy of the dipole, at that instant.