140) Two identically charged spheres are suspended by strings of equal length. When they are immersed in kerosene, the angle between their strings remains the same as it was in the air. Find the density of the spheres. (The diectric { constant of kerosene is 2 and its density is 800

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Q. Two identical non-conducting solid spheres of same mass and charge are suspended in air from a common point by two non-conducting, massless strings of same length. At equilibrium, the angle between the strings is

α

. The spheres are now immersed in a dielectric liquid of density

800 {kg m}^{- 3}

and dielectric constant

21

. If the angle between the strings remains the same after the immersion, then

Two identical charged spheres are suspended by strings of equal length and the strings make certain angle with each other. When suspended in a liquid of density $400 k g / m^{3}$ , the angle between the threads remains the same. If the density of the material of the sphere is $1600 k g / m^{3}$ , the dielectric constant of the liquid: