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Two identical ball having mass density `rho` , mass m and charge q are suspended from a common point by two insulating massless strings of equal length. At equilibrium each string makes an angle theta with the vertical. Now both the balls are immersed in a fluid. At equilibrium, theta remains same. If the mass density of liquid is `sigma` then dielectric constant of liquid will be

A

`(sigma/rho-sigma)`

B

`(rho/rho-sigma)`

C

`sigma/rho`

D

`rho/sigma`

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