A short electric dipole has a dipole moment of $16\times 10^{-9}$ C m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the dipole axis is : $\left ( \frac{1}{4\pi \epsilon _{0}}=9\times 10^{9} Nm^{2}/C^{2} \right )$