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Two identical balls each having a densit...

Two identical balls each having a density `rho` are suspended from as common point by two insulating strings of equal length. Both the balls have equal mass and charge. In equilibrium each string makes an angle `theta` with vertical. Now, both the balls are immersed in a liquid. As a result the angle `theta` does not change. The density of the liquid is `sigma`. Find the dielectric constant of the liquid.

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