Use the conductivity of copper given in Table 10.1 to calculate the resistance of a copper wire that is 3 mm in diameter and 20 cm long.

 Table 10.1

Substance Ag Cu Al Na ReO; Ti La SrMoO; Bi Mn NbN TiO G (S/m) 6.2x107 5.9x10 3.810 2.1x10 1.110 2.5106 1.6x106 1.0x10 7.7105 6.2x10 4x10 3x10 Substance BiRUO, LaNiO, Doped polyacetylene Fe304 YBaCu3O,* Ge Si NiO AlO3 S SiO (quartz) Teflon (S/m) 2105 1x10 8x10 2x10 110 210 10- 10-8 10-12 10-15 10-16 10-22