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Two identical charged spheres of materia...

Two identical charged spheres of material density `rho`, suspended from the same point by inextensible strings of equal length make an angle `theta` between the string. When suspended in a liquid of density `sigma` the angle `theta` remains the same. The dielectric constant K of the liquid is

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The correct Answer is:
`sigma=(epsilonrrho_0)/(epsilon_r-1)`
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