Задача id10450

Two identical balls hang on non-conducting threads of equal length, fixed at one point. The balls are charged with charges of the same name and, repelling, diverge at a certain angle. Find the density of the material of the balls if the angle of divergence of the threads does not change after immersing the balls in a liquid with a density of 800 kg/m3 and a dielectric constant of 9.

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