4. Determine the electrokinetic potential at the phase boundary of the ceramic filter - an aqueous solution of KCl, if the flow potential is 6.5 * 10-3 V when the solution flows under a pressure of 2 * 104 Pa. The specific electrical conductivity of the medium λ = 0.141 Sm * m-1, viscosity 1.3*10-2 Pa*s, relative permittivity 80.1, electric constant e0=8.85*10-12 F/m.

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