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Two identical spheres of same mass and s...

Two identical spheres of same mass and specific gravity (which is the ratio of density of a substance and density of water) 2.4 have different charges of Q and -3Q. They are suspended from two stings of a same length l fixed to points at the same horizontal level, but distant l from each other. When the entire set up is transferred inside a liquid of specific gravity 0.8, it is observed that the inclination of each string in equilibrium remains unchanged. Then the dielectric constant of the liquid is

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Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle 30^(@) with each other. When suspended in a liquid of density 0.8 gm//cm^(3) , the angle remains the same. If the density of the material of the sphere is 1.6 gm//cm^(3) , the dielectric constant of the liquid is :