Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle θ with each other. When suspended in water the…

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle $\displaystyle \theta$ with each other. When suspended in water the angle remains the same. If density of the material of the sphere is $\displaystyle 1.5 \mathrm{~g} / \mathrm{cc}$, the dielectric constant of water will be $\displaystyle \_\_\_\_$ (Take density of water $\displaystyle =1 \mathrm{~g} / \mathrm{cc}$ )