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<p>species, on which an external electric field exerts an <a href="page.php?w=electrostatic">electrostatic</a> <a href="page.php?w=Coulomb_force">Coulomb force</a>. According to the <a href="page.php?w=Double_layer_%28interfacial%29">double layer</a> theory, all surface charges in fluids are screened by a <a href="page.php?w=diffuse_layer">diffuse layer</a> of ions, which has the same absolute charge but opposite sign with respect to that of the surface charge. The <a href="page.php?w=electric_field">electric field</a> also exerts a force on the</p><p>
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