2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27089We study the 4-probe bend conductance $G_{14,32}$ of a mesoscopic crossed wire structure in the ballistic regime in the absence of a magnetic field, which for normal devices is usually negative. We predict that for sufficiently large devices and for small applied voltages $G_{14,32}$ becomes positive in the presence of Andreev scattering, but at large voltages $G_{14,32}$ remains negative.9 pages, 1 postscript figure available on request to pya055@cent1.lancs.ac.uk (Simon Robinson), LaTex version 2.09Condensed Mattertext