Find the resistance of a tube with length l = 84 cm and cross-sectional area S = 5 mm2, if it is filled with air ionized so that in 1 cm3 there are n = 107 pairs of ions in equilibrium. Ions are monovalent. Ion mobility u+ = 1.3 10–4 m2/(V s) and u– = 1.8 10–4 m2/(V s).
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