Electrostatics

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of \(37^{\circ}\) with each other. When suspended in a liquid of density \(0.7 \mathrm{~g} / \mathrm{cm}^3\), the angle remains same. If density of material of the sphere is \(1.4 \mathrm{~g} / \mathrm{cm}^3\), the dielectric constant of the liquid is _______ \(\left(\tan 37^{\circ}=\frac{3}{4}\right)\)