A short electric dipole has a dipole moment of $16 \times 10^{-9} \mathrm{C} \mathrm{m}$. The electric potential due to the dipole at a point at a distance of $0.6 \mathrm{~m}$ from the centre of the dipole, situated on a line making an angle of $60^{\circ}$ with the dipole axis is : $\left(\frac{1}{4 \pi \varepsilon_{0}}=9 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{C}^{2}\right)$ (1) $400 \mathrm{~V}$ (2) Zero (3) $50 \mathrm{~V}$ (4) $200 \mathrm{~V}$