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In a liquid medium of dielectric constan...

In a liquid medium of dielectric constant `K` and specific gravity `2` two identically charged spheres are suspended from a fixed point by threads of equal length .The angle between them is `90^(@)` .In another medium of unknown dielectric constant `K^(1)` and specific gravity `4` the angle between them become `120^(@)` if density of material of spheres is `8gm//c c` then` K^(1)` is

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