5. At what current intensity in the process of electroosmotic motion of an aqueous solution of KCl through a polystyrene membrane, its volumetric velocity will be 5.5 × 10 -10 m 3 / s if ε = 81; ε 0 = 8.85⋅10 -12 F / m; ξ = 10 -2 V; the specific electrical conductivity of the medium is ω = 9⋅10 -2 Ω -1 ⋅ m -1; viscosity η = 10 -3 Pa · s?
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