Electrostatics Part 2

Two identical charged spheres are suspended by string of equal lengths. The string make an angle of 37∘ with each other. When suspended in a liquid of density 0.7g∕cm3, the angle remains same. If density of material of the sphere is 1.4g∕cm3, the dielectric constant of the liquid is ______(tan‌37∘=‌

3

4

).