Two cylindrical conductors with equal cross sections but different resistivities are put end-to-end. Find the magnitude of the charge that accumulates at the boundary between the conductors if a current I=100A flows in the wires. The wires are made of aluminum and copper with resistivities ρCu=1.7×10−8Ω⋅m and ρAl=2.8×10−8Ω⋅m, respectively. This charge should be very small even for this large current I=100A.
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