A narrow germanium rod has a cross-sectional area of 1.00 cm² and a length of 25.0 cm. Determine its resistance at ≈20 °C.

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SUBSTANCE Aluminum Brass Constantan (60% Cu, 40% Ni) Copper Iron Manganin (84% Cu, 12% Mn, 24% Ni) Mercury Nichrome (~59% Ni, 23% Cu, 16 % Cr) Platinum Silver Tungsten Carbon Germanium Silicon Glass Neoprene Polyethylene Porcelain Porcelain Teflon Sodium chloride (saturated solution) Blood Fat *Values determined at or near 20 °C. TABLE 26-1 Resistivities* RESISTIVITY (p) (IN 2 - m) 2.8 × 10-8 28 × 10-8 244 x 10-8 1.7 × 108 ≈10 × 108 44 x 10-8 96 × 10-8 100 × 10-8 10 × 10-8 1.6 × 10-8 5.5 × 10-8 3.5 x 10-5 0.46 100-1000 100-10¹4 10⁹ 10%-10⁰ 107-10¹¹ 10¹-10¹2 10¹4 0.044 1.5 25