25. In studying the sol of soil particles by the method of electrophoresis, their displacement was found to be 0.25⋅10 -2 -2 m in 60 minutes with a superimposed voltage of 5.8 V and a tube length of 34.6⋅10 -2 m. Determine the electrokinetic potential of the sol , if the viscosity of water is η = 10 ^ -3 Pa · s; ε = 81; ε0 = 8.85⋅10 ^ -12 F / m.
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